Definition:
Meta data is data about data. In other words, it is information about the Web page that it is currently on. Meta data is usually information that is more useful to programs and scripts than to the customers reading the page. So, meta data is stored in meta tags that are hidden in the <head> of the HTML document.
Meta data is most often used for search engine optimization (SEO). The two most critical meta tags used in SEO are: description and keywords. These are sometimes used by search engines to place the pages in the search directory, and they are used to provide a short description of the Web page in the search results.
