What are types of carrier proteins?

Carrier proteins are a type of cell membrane protein that is responsible for transporting substances across the membrane. Depending on the energy source, the carrier proteins may be classified as ATP-driven or electrochemical potential-driven. 

• ATP-driven carrier proteins require ATP to transport molecules. This form of active transport in which a form of chemical energy such as ATP fuels the process is known as primary active transport.
• Electrochemical potential-driven carrier proteins require an electrochemical potential gradient to fuel their transport activity. This form of active transport is called secondary active transport.