Important when you can't remember the name of the imagefile you are trying to link to. An element is a fundamental component of the structure of a text document. Some examples of elements are heads, tables, paragraphs, and lists. If so, those are example of elements. HTML tags are instructions to the browser on how to display the text.
Different browsers display elements differently.
To denote the various elements in an HTML document, you use tags. Please note that while HTML is not case sensitive, URLs are. Also, not all tags are supported by all World Wide Web browsers. Some HTML tags are listed below. See one of the two reference pages above for more in-depth coverage of HTML tags.