Before 1983, visiting a host on a network required typing in its IP address. The fledgling internet was much smaller, and reaching individual sites was only possible if you knew where to look. Fortunately, the Internet Engineering Task Force introduced their pioneering Domain Name System (DNS), allowing numerical IP addresses to be identified as specific domain names. Instead of having to remember a long sequence of numbers, like 69.171.234.21, you only have to remember a URL: Facebook.com. Along with the new DNS, domain extensions appeared. A domain extension is the top-level part of the domain name (TLD), such as .com,...
Read the full article: What URL Domain Extensions Stand For and Why They Are Needed
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