So how can these characters appear as themselves in the page? The answer: HTML "entity escapes."
In the page you're looking at, I am writing < as <, > as >, and & itself as &. These special "escape" sequences are recognized by all web browsers. See the following table:
Most HTML editors provide more convenient ways to do this. In a WYSIWYG (What You See Is What You Get) editor like Microsoft Word, of course, you never see your raw HTML, and <, > and & are automatically escaped for you. More web-savvy tools like Macromedia Dreamweaver also provide ways of dealing with this in an elegant fashion.
There are other HTML entities which can be used to represent characters not found all keyboards which are nevertheless common, like the © copyright symbol. The escape for copyright is: ©. For a detailed guide to the "entities" available in HTML, see the w3schools website.
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