We've already seen one type of heading, a top level heading denoted by the <H1>....</H1> pair. As you would expect, HTML supports many different levels of headers, with H1 being the largest, getting progressively smaller with H2, H3 and so on down to H6. Exactly which font and size a particular heading will be displayed with depends on which browser you use to view the text - some text based browsers won't do anything, but more fancy graphical browsers such as Mosaic will choose a sensible set of fonts. 
HTML also lets you specify that a piece of text should be in a bold typeface using the <B> ... </B> combination, or in an italic typeface using the <I> ... </I> combination.
Thus the HTML:
<I>The</I> <B>Guardian</B> newspaper titles look like thisresults in:
The Guardian newspaper titles look like this