A TLD (top-level domain) is the last part of a domain name, located after the final dot. It is the highest level of the domain name system (DNS) hierarchy on the internet. TLDs are used to distinguish and categorize different types of domain names based on their purpose or geographical location.

Some examples of commonly used TLDs include .com, .org, .net, .edu, .gov, .nl, .eu, and so on. Each TLD has its own specific meaning and purpose. For instance, .com is mainly used for commercial websites, .org for non-profit organizations, and .edu for educational institutions.

There are also country-specific TLDs, such as .nl for Netherlands, .fr for France, and so on. These TLDs indicate that the website is targeted at or originated from that specific country.