There's basically four types of banners currently in the industry. Static Image banners, Animated GIF banners, Flash banners and Interactive banners.
Below are examples of the Common Standard Banner sizes used for Online banner advertising and marketing. When creating or designing a banner it's common practice to follow these sizes. Two additional sizes being used, but not recommended are 350x300 and 720x300. Typically these two sizes open in a separate browser window or tab in the form of a Pop-Up ad. This practice is highly frowned upon with online viewers, therefor most companies have done away with them.

The standard sizes for banners have been formulated by the Internet Advertising Bureau.
If you'd like us to design some banners for you, send us a Quote Request and someone will get back with you within 24hrs.