Tags and Elements are not the same.
Elements
They are the pieces themselves, i.e. a paragraph is an element, or a header is an element, even the body is an element. Most elements can contain other elements, as the body element would contain header elements, paragraph elements, in fact pretty much all of the visible elements of the DOM.
Eg:
<p>This is the <span>Home</span> page</p>
Tags
Tags are not the elements themselves, rather they're the bits of text you use to tell the computer where an element begins and ends. When you 'mark up' a document, you generally don't want those extra notes that are not really part of the text to be presented to the reader. HTML borrows a technique from another language, SGML, to provide an easy way for a computer to determine which parts are "MarkUp" and which parts are the content. By using '<' and '>' as a kind of parentheses, HTML can indicate the beginning and end of a tag, i.e. the presence of '<' tells the browser 'this next bit is markup, pay attention'.
The browser sees the letters '
' and decides 'A new paragraph is starting, I'd better start a new line and maybe indent it'. Then when it sees '
' it knows that the paragraph it was working on is finished, so it should break the line there before going on to whatever is next.- Opening tag.
- Closing tag