Top-Level Domains (TLDs) are the last part of a domain name, appearing after the final dot. They help categorize websites and indicate their purpose or origin. Common examples include .com for commercial sites, .org for organizations, and .edu for educational institutions. TLDs are managed by organizations like the Internet Corporation for Assigned Names and Numbers (ICANN). There are two main types of TLDs: generic TLDs (gTLDs) and country code TLDs (ccTLDs). gTLDs are not tied to any specific country, while ccTLDs represent specific nations, such as .uk for the United Kingdom or .ca for Canada. TLDs play a crucial role in the structure of the internet.