If you are in search of defining how JPEG made banner ads look and are developed actually, there are many choices and explanations for such purposes because since there would only be used a single frame or instance while creating JPEG ads, so using a term such as one frame animation could be great to be applied to such web banners and graphics. Please note that the term and word used is going to be like a metaphor because everybody already knows that no animations are being used in development and making of the JPEG ads and the professional banner design area and zone is already loaded with such graphics and web pictures. Now, why using the term one frame animated file anyway? You know, when you launch your web browsing software like the Internet Explorer or Firefox and then access a certain website which contains many JPEG made graphics and ads, you already know that such ads and files will remain the same with no changes because the JPEG files contrary to the GIF made animations will not be having starter and ending makers and points in between the frames because only one single frame and instance is being used in their development. So you see, from this perspective and viewpoint, the term specified and explanation made can be nice to use and choose while trying to define the term JPEG web banner. If you are going to fill up a certain spot and space on your web page and are interested in using a JPEG made ad and graphic for the project, you can easily count on having numerous possibilities and very attractive options in this regard and JPEG files are feature rich and very powerful from artistic viewpoints. While trying to concentrate over creating JPEG files and graphics, do not limit yourself to some predefined terms and dimensions because you can always come up with custom sizes.