Active transport is a type of cellular transport mechanism that involves the movement of molecules or ions across a cell membrane from an area of lower concentration to an area of higher concentration, against the concentration gradient. This process requires energy, usually in the form of ATP (adenosine triphosphate), to pump the molecules or ions against their natural direction of movement.
This is indirect. It uses the energy stored in an electrochemical gradient (created by primary active transport) rather than ATP directly. what is active transport in a cell