What process can be defined as energy being transferred from one object to another because of the temperature difference between them?

when there is a transfer of heat from one part to another due to a change in temperature between them is called heat.

Explanation:

when there is a transfer of heat from one part to another due to a change in temperature between them is called heat.

Heat energy is due to movement energy particles from one body to another. There are various ways through which heat can be transfer. some of them are listed below

conduction -  

convection

radiation