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The <meta> tag is a clever invention. It lets you include essentially any information you want in an HTML document. A <meta> tag has two attributes, name and content. You write a <meta> tag like this:
<meta name="tag name" content="tag content" />
You can use any text you want for the name and content attributes. The " tags stands on its own--there is no closing tag required. You can have as many " tags as you like in a document.
What do <meta> tags do? Nothing. They are simply a way to include additional information in an HTML document. It does not affect how the document is displayed, but the information is available for programs that are looking for it. For example, many people use <meta> tags to include a description and a list of keywords in a document. Many search engines are programmed to look for these meta tags and use the contained information as an aid for indexing and listing the page. For example if you were creating a Web page that explained the basics of HTML, you could use <meta> tags to include a description and keywords like this::
<meta name="description" content="Introduction to HTML" />
<meta name="keywords" content="HTML, Web page design" />