A header is an image that is placed on top of the website or blog. It is normally horizontal in size which consists mainly of logo, tagline or some other elements such as social media icons, advertisement banner or search bar. In addition, the header will usually contain the primary color so it also helps to set the look and feel of the website or blog. Now the difference between that and a banner is that a banner serves a different purpose than a header. It is normally used for informative or advertising purposes and come in different sizes. The standard banner found on most blogs or websites is 125x125 or 250x250 pixels. Many websites use banners for ways of producing revenue. Alot of companies use to use them, but now many users of the website or blog find the banners to be annoying and troublesome.