What is difference between kilowatt hour and kiloamp hour?

A kilowatt hour is the amount of energy consumed, over a period of one hour, at the rate of one kilowatt. It's used by your electricity utility company for measuring the energy you consume, for the purpose of billing. It's SI equivalent is measured in joules.

A kiloampere hour is a unit of charge. It's SI equivalent is measured in coulombs. Batteries are often rated in ampere hours.