Domain extensions, also known as top-level domains (TLDs), are the suffixes at the end of a web address that indicate the type or purpose of a website. Common examples include .com, .org, and .net. Each extension serves a different function; for instance, .com is typically used for commercial businesses, while .org is often reserved for non-profit organizations. There are also country-specific domain extensions, such as .uk for the United Kingdom and .ca for Canada. These TLDs help identify the geographical location of a website or its target audience. With thousands of options available, choosing the right domain extension can enhance a site's credibility and relevance.