How many catigories of bit map images are there

four

Bitmap images can contain any number of colours but we distinguish between four main categories: Line-art. These are images that only contain two colours, usually black and white. Sometimes these images are referred to as bitmaps because a computer has to use only 1 bit (on=black, off=white) to define each pixel.

top and bottom view

explanation:

(http) hyper text transfer protocol

which means its an input that allows the "site" to connect with severs.