What Active Transport -

Active transport is a type of cellular transport that involves the movement of molecules across the 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 molecules against their natural direction of movement.

For substances too large to pass through protein pumps, such as proteins or bacteria, cells use , which also requires energy: Active Transport | Definition, Types & Examples - Lesson what active transport

Active transport is a vital, energy-driven process that allows cells to control their internal environment with precision. While passive transport handles equilibrium-based needs, active transport creates the disequilibrium —the differences in concentration and charge—that makes life processes like thinking, moving, and growing possible. Without it, cells would be at the mercy of their surroundings and could not maintain the order necessary for life. Active transport is a type of cellular transport

The most famous example is the found in animal cell membranes. Transporters are categorized by the direction and number

Transporters are categorized by the direction and number of molecules they move: Moves one specific molecule in one direction.