If any one wants to make a website in a very professional manner, he/she must know HTML. One can't do much with WYSWYG(What You See is What You Get) editors. Even if one has no plans of making a website, studying HTML is a very good option as it is very useful in many ways.
HTML is a document-layout and hyperlink-specification language. It defines the syntax and placement of special, embedded directions that aren't displayed by the browser, but tell it how to display the contents of the document, including text, images, and other support media. The language also tells you how to make a document interactive through special hypertext links, which connect your document with other documents-on either your computer or someone else's, as well as with other Internet resources, like FTP.Fundamental Purpose of HTML
With all its multi media-enabling, new page layout features, and the hot technologies that give life to HTML documents over the Internet, it is also important to understand the language's limitations HTML is not a word processing tool, a desktop publishing solution, or even a programming language. That's because its fundamental purpose is to define the structure and appearance of documents and document families so that they may be delivered quickly and easily to a user over a network for rendering on a variety of display devices. Jack of all trades, but master of none, so to speak.
Before you can fully appreciate the power of the language and begin creating effective HTML documents, you must yield to its one fundamental rule: HTML is designed to structure documents and make their content more accessible, not to format documents for display purposes.
With HTML, content is paramount; appearance is secondary, particularly since it is less predictable, given the variety of browser graphics and text-formatting capabilities. Besides, HTML contains many more ways for structuring your document content without regard to the final appearance i.e. section headers, structured lists, paragraphs, rules, titles, and embedded images are all defined without regard for how these elements might be rendered by a browser.Specific Limitations of HTML
There are limits to the kinds of formatting and document structuring HTML can provide, and no current browser implements all of the ones the new HTML standard prescribes. Specifically, various browser manufacturers had implement several HTML features before the standard emerged in late 1997. These include: