Tags on a website refer to specific snippets of HTML or JavaScript code that perform various functions. There are different types of tags, including meta tags that provide search engines with information about the webpage, analytics tags that track user behavior, and content tags used for organizing and categorizing content. These tags help improve the functionality and efficiency of a website, enhance SEO, track and analyze user engagement, and facilitate content management. Properly using tags is crucial for ensuring that a website is well-structured and easily navigable both by users and search engines.