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you're on the internet let's say you want to watch an informative video on a

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technical topic so of course you open yet another window in your browser and

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you type youtube.com into the search bar or maybe instead you type

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dailymotion.com or Floatplane.com what all these websites have in common other

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than video hosting is their domain extension.com this is what we call a top

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level domain or TLD it's basically a code that instructs your computer where

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to look up the IP address of the website you're trying to find in the domain name

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system or DNS the big directory of everything the World Wide Web has to

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offer so if you're going to mail.google.com your computer will first

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go to the top level domain com then search the domain inside it Google then

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the subdomain inside that if there is one in this case mail the original

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decision to have the TLD come last was

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largely arbitrary at the time though with new modern autocomplete features

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it's handy to be able to just type in the first few letters of the domain or

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subdomain which are far more specific different tlds have different meanings

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and are grouped according to their intended purpose into five distinct

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categories some of which are pretty interesting first is the group for

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infrastructure tlds this group such as

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it is actually only contains one domain arpa arpa was the first domain created

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and is used for a lot of basic processes that allow the internet to function like

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reverse DNS lookups which allow computers to find the domain name that

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corresponds with an IP address next are generic tlds which are further divided

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into generic unrestricted and generic restricted the difference being that

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anyone can apply for a generic unrestricted domain while generic

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restricted domains have certain eligibility requirements for example

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restricted domains include dot Pro which is for accredited professionals like

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accountants and lawyers originally the only unrestricted TLD was dot info

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tldslike.com.net and Dot org used to be restricted domains for commercial

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entities networks and organizations respectively but the rules about who

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could register a domain and under them went largely unenforced and eventually

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just disappeared.com is far and foremost the

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most popular TLD on the internet with a 52.8 percent share of all websites the

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second most popular TLD is dot org with 4.4 that's why companies that operate

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solely on the internet are known as dot-coms they even named an entire

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Financial collapse after it this popularity is to the extent that users

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often misremember websites under other tlds as having.com extensions leading

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organizations like Wikipedia.org to also

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register wikipedia.com as a redirect to

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their main site other more unsavory actors like scammers might register a

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similar subdomain but under a different top level domain in order to trick

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unwear users into thinking it's a more trustworthy site a practice known as

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typo squatting the collaborative nature of the internet means that many tlds

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wound up being used for vastly different purposes than they were originally

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intended depending on the decisions of the The Entity charged with managing

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them one example is dot TV the TLD used

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by little-known website called twitch dot TV is not as one may assume a

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generic TLD for television shows and video streaming what is it then we'll

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tell you right after our word from our sponsor who you can find at grammarly

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using the everpopular.com TLD whether you're writing a script for a YouTube

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video or emailing your boss to ask for a raise ensuring you have proper

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communication and tone is key that's why we recommend checking out grammarly

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premium's tone rewrite suggestions feature Sven on the business team use

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this feature daily as it helps him ensure his writing is coming across as

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clear and as confident as he is I met

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the guy just he's confident and when he has to communicate hard deadlines to his

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clients grammarly has his back with their confident tone suggestions getting

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started is super easy all you have to do is install the desktop app log in and

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start typing go to grammarly.com techwiki to sign up for a free account

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and get 20 off grammarly premium today dot TV is actually part of the largest

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TLD group country code tlds which contain 308 domains country code tlds

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are typically restricted to Citizens residents and organizations with some

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presence in the associated country they include dot UK for the United kingdom.ru

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for russia.ca for Canada and the sadly

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neglected dot us for the United States dot TV belongs to the small island

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nation of tuvalu population 12 000

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primary export fish in the late 1990s the tuvalu government licensed use of

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its TLD extension for the purpose of marking television shows and used the

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proceeds to buy tuvalu's entry into the United Nations then there are sponsored

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tlds which need no Segway these are proposed and managed by private

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organizations these include

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domainslike.edu.gov and Dot mil which

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are restricted to educational institutions the US government and the

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U.S military respectively there's also dot triple X for other websites

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featuring Vin Diesel or not finally there are test tlds which are used to

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test software dot example Dot invalid.localhost and DOT test are

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reserved for use by the internet engineering task force and are not even

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installed in the DNS directory this is so that no current or future domain name

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registered in the DNS will conflict with one of these testing domains that's a

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lot of information but there's not going to be a quiz after this thank you for watching like if you like dislike if you

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didn't and if you'd like to know more about the DNS system and how it works

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check out this video from 2016. don't forget to follow And subscribe