Active Transport: Active transport is a type of membrane transport that requires energy expenditure by the cell to move substances against their electrochemical gradients.
Diffusion: Diffusion is a passive process where particles move from an area of higher concentration to an area of lower concentration, down their electrochemical gradient.
Facilitated Diffusion: Facilitated diffusion is a type of passive transport that uses specific carrier proteins or channel proteins to allow substances to move down their electrochemical gradients.