During active transport, what is used to move a substance through the cell membrane?

In cellular biology, active transport is the movement of molecules across a membrane from a region of their lower concentration to a region of their higher concentration-against the concentration gradient. Active transport requires cellular energy to achieve this movement. There are two types of active transport: primary active transport that uses ATP, and secondary active transport that uses an electrochemical gradient. An example of active transport in human physiology is the uptake of glucose in the intestines.