Pre-made, copyright-free illustrations are called . apps clip art graphic design stock photos

clip art

Explanation:

The clip arts are graphic images that are pre-made illustrations for the purpose of creating any medium (designs or art). It has no restrictions to use them, it can be used by anyone, hence its copyright-free.It comes in both electronic and printed form.But mostly they are designed and distributed and used by a person in an electronic form.

Hence, the complete statement is "Pre-made, copyright-free illustrations are called clip art".

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