How to italicize text in Markdown?

Markdown provides two ways of making anything italic. You have to type one asterisk or underscore before and after the text that you want to italicize.

For compatibility, it is recommended that you use an asterisk instead of an underscore for italicizing words.

Markdown HTML Output
This is an *italic text.* This is an <em>italic text.</em>
This is also an _italic text._ This is also an <em>italic text.</em>