It all depends on where it is coming from. It could be something as simple as a loose clamp on a hose; to something as bad as a cracked block, radiator, or a bad water-pump. I suggest starting the car, then looking underneath, to see where the water is coming from
A vacuum leak is one possibility.
Evaporation.
water pumps have a seap hole that will leak when they go bad ,visually inspect this first
a leak
You have to replace it. They are designed to leak when they are going bad.
Because there is a hole in it.
This is usually a head gasket problem, meaning the engine will eventually fail without testing and/or repair.
Yes, if there is internal leak.
Cylinder miss, broken motor mount, or vacuum leak.
A leak, either the pressure line or somewhere in the compressor.
Water is a by product of the combustion and is normal.
Could be many reasons such as contaminated fuel (water), could be in need of a tune up, could be a large vacuum leak,