The italics tags should be used to highlight a key word or phrase. These tags are not intended to to stylize or shape your font face. Rather, use them to emphasize text or words.
Example:
Italic <i>tag</i>!
<em>Emphasized</em> Text!
Create a <blockquote>blockquote</blockquote>!
Format your <address>addresses</address>!
OutputItalic tag!
Emphasized Text!
Create a blockquote
!
Format your addresses! Each of the above tags is generally interpretted by the browser in a similar way. The two commonly used tags to place italics onto a website are <em> and <i>. They are short and sweet.
Both the <b> and the <i> tags can be placed within other elements to format your texts. They can also be used together to bold and italisize words or phrases. Nothing fancy here, just be sure you open and close the tags in the same order.
Example:
<p>Phillip M. Rogerson <b><i>MD</i></b></p>
OutputPhillip M. Rogerson MD
This is brilliant when placing text links directly inside your paragraphs as a reference to the user.