Within APA the following items are all considered figures:
any other illustrations or nontextual depictions
Figures are cited with a reference list and an in-text citation (using either author-date or narrative citation systems) and, in addition, also have specific rules for how they are formatted and referred to within a paper. You can find these requirements on the APAStyle website or the Publication Manual of the American Psychological Association, Chapter 7 Tables and Figures.
If you reprint or adapt a figure from another source in your paper (e.g. an image from the internet) you must include a copyright attribution in the figure note indicating the origin of the reprinted or adapted material in addition to a reference list entry for the work.
You may also need to obtain permission from the copyright holder to reprint or adapt a figure.