Web pages are written in a text markup language called HTML (HyperText Markup Language). The idea of HTML is that you annotate, or mark up, regular text with special tags that indicate structure and formatting. For example, the title of a Web page is defined like this:
<TITLE>My Home Page</TITLE>
The tags provide general formatting guidelines, but the browsers that display HTML pages have freedom in how they display things. This keeps the markup simple. The general syntax for HTML tags is:
<tag parameters>normal text</tag>
As shown here, the tags usually come in pairs. The open tag may have some parameters, and the close tag name begins with a slash. The case of a tag is not considered, so <title>, <Title>, and ...