The Content Editor Web Part (CEWP) allows you to add text, html, scripts or styles to a SharePoint page. Its versatility makes it a favorite among Web designers.

The fpweb.net site offers a tutorial on how to add a CEWP to a page:
http://www.fpweb.net/sharepoint-tutorials/ContentEditorWebPart.asp

The CEWP has two edit options: [Full article]