Definition: TLD stands for Top-Level Domain, which are strings that mark certain types of domains such as .com, .net, etc. Each TLD has a unique name and can be used to identify specific types of websites or services. Definition: A TLD is a prefix added to the end of a domain name. It helps distinguish between different web pages or online resources based on their structure and content. For example, .com represents a commercial website, .edu refers to an educational institution's site, and .org means a non-profit organization.