How to see if a picture is a bitmap or a vector?

If saved in a computer, depending on the saving format, *. AI，*。 Cdr etc. Is a vector graphics format, JPG and PNG are bitmap formats. If you don't save it, edit it in the software and enlarge the picture wirelessly. It is really a vector diagram, and the distortion is a bitmap.

1, open Photoshop.

2, enlarge the picture, there will be some pixel format, the picture will be distorted, this is the bitmap.

3. open AI.

4. Enlarge the picture infinitely, but the picture will not be distorted. This is a vector diagram.