Cameras can be categorised in various types as mentioned below.
Action Camera - GoPro
Digital camera - Point and Shoot, DSLR, (MILC, DSLM, EVIL)
There are mainly 3 types of Digital Cameras
Mirrorless - (MILC, DSLM, EVIL)
Difference between Camcorders and above Digital Cameras is that Camcorders have smaller size sensors and
also bokeh effect is not good in Camcorders.
In Compact cameras (e.g. Canon G7 X mark II ), You can not change the lense. But in DSLR and MILC, you can change the lense.
In DSLR, there is a physical viewfinder so size of camera is larger than MILC.
Action cameras are usually used by cyclists, motorists, swimmers to shoot the videos while they are
doing any activity. Camera is usually attached to body so hand free operation is possible.
GoPro is very popular brand in Action Cameras.
Drone cameras are usually used for aerial photography. But there are lot of restrictions on the use of
drones. E.g. If you can use drones only in specific areas in city only. Also you might need license
to use drone in some cities as well.