The header is a graphic image, can be static, flash or animated. The header is one of the most important components of your website because it represents the first impression for your site visitors, and it could leave a lasting impact. A website’s header must be able to achieve what you want to achieve-to effectively convey what you want to tell your users when they visit your site. Header often contains the name of your site/title, your own slogan, and your labels.
The animated header is a usually greater visual impact; the format used for this type of header is only GIF, and usually developed with image editing software like Adobe ImageReady.
Flash header is a header format SWF, developed with software like Adobe Flash Professional for creating animation and multimedia content. Flash headers are usually very high quality and impact.