Clip Art is the term used when defining digitized or electronic drawings.
Common formats that are used are PICT, Paint, PNG, GIF, TIFF, EPS, JPG and JPEG. Clip Art can be copied and added to desktop publishing programs, brochures, newsletters, and other documents created with programs or used in web presentation.
The definition of Clip Art emphasises that it does not include background images but rather "A collection of icons, pictures, buttons and other useful image files along with sound and video files that can be embedded or inserted into web pages.
". If you want to have an image to go with, say, a blog entry, you would want clipart. Same for newsletters, magazines, journals...