Using HTML, you can control how information is displayed. You can create links or pointers to other documents, include graphics, change the font and typestyle, include tables, columns or forms and many other formatting features. When you're thinking about HTML, keep in mind that the language was intended to describe the structure of a document, not the layout of the page itself. If it seems clunky and imprecise, that's because HTML was never intended to be used for design. HTML tags are the instructions that surround material such as text, images and links.
Tags tell the Web browser how to display that material.
Most HTML tags are containers, meaning they have a beginning and an end tag. Be sure to close whatever you open. For some tags, the end tag is optional, but when in doubt include the end tag. First tag on, last tag off. HTML tags can be applied to content containing other HTML tags for multiple tag effects on a single element.