Top-level domain names (TLDs) are the last part of a domain name, such as .com, .net, and .org. These TLDs are used to classify the type of website or organization that the domain name belongs to, and they are managed by the Internet Corporation for Assigned Names and Numbers (ICANN), which is the organization responsible for coordinating the global domain name system.

There are several types of TLDs, including generic TLDs, such as .com, .net, and .org, which are commonly used by businesses and organizations. There are also country-code TLDs, such as .uk for the United Kingdom and .ca for Canada, which are used by websites that are associated with a specific country.

In addition to these traditional TLDs, there are also new TLDs that have been introduced in recent years, such as .blog, .shop, and .app, which are designed to provide more specific and descriptive options for domain names.

Overall, TLDs are an important part of the domain name system, and they are used to classify and categorize websites and organizations on the internet.