Text formatting in HTML is pretty straight forward. The most common of the formatting tags are bold, italic, underline, and typewriter type. Each tag functions in the same manner which an on tag and an off tag. Be careful to properly balance your tags.

<b></b> - Bold.

Example: This word is bold.
Code: This <b>word</b> is bold.

<i></i> - Italic.

Example: This word is italic.
Code: This <i>word</i> is italic.

<u></u> - Underline.

Example: This word is underlined
Code: This <u>word</u> is underlined.

<tt></tt> - Typewriter type - uses a fixed width font like courier.

Example: This sentence is in typewriter type format
Code: <tt>This sentence is in typewriter type format</tt>

You may also mix and match by combining tags in any way you want.

Example: This entire sentence is bold, and only this word is italic.
Code: <b>This entire sentence is bold, and only this <i>word</i> is italic.</b>

Example: This entire sentence is underlined, this word is bold, this word is italic and this word is both!

Code: <u>This entire sentence is underlined, this <b>word</b> is bold, this <i>word</i> is italic and this <tt><b><i>word</i></b><tt> has the works!</u>