What is the difference between a protectorate and a colony?

A protectorate is an autonomous territory that is protected either by diplomatic means or military means by a state that is stronger than the autonomous territory. In return, the protectorate accepts certain obligations from the stronger state, but it still seen in the international community as sovereign. A colony is a state that is under immediate control of a stronger state and has no say whatsoever in it's own politics, economics and society, as that is under the control of the stronger state.