What is the main difference between different types of map projections?

the amount of physical space they take up

the type of information they display

the way they distort the Earth's landmasses

the area of the Earth they focus on

The type of information they display.

There are many different types of maps used for many different purposes. For example, topographic maps show relief of an area, usually using contour lines while political maps show governmental boundries, locations of cities, and significant bodies of water.