A mode refers to a specific pattern of vibration in a standing wave, characterized by its frequency and wavelength, while a node is a point in that wave where the medium remains stationary. In standing waves, nodes occur at fixed intervals, and the number of nodes helps determine the vibrational mode. Anti-nodes, in contrast, are points of maximum movement. Understanding these concepts is essential for analyzing wave behavior in various physical systems. The distinction between modes and nodes is crucial for studying harmonics and wave dynamics.