Two Main categories

Vector Graphics

Defined by the set of primitives that define the drawing

E.g., lines from 1 point to another, a box of a certain size

Are converted into pixels for display but not stored as pixels

Graphs, animation, mix of drawing and texts

Bitmap images

Defined by the set of points of the image surface : the set of pixels

Photographs : rich in colours, more tolerant to compression

Graph like, icons : limited number of colours, mainly flat tint