A propagation of disturbance or oscillatory behavior
across space and time, typically involving periodic motion or energy
transfer without permanent displacement of the medium.
How would you explain it like I'm…
Ripples that travel
Drop a pebble in a pond and watch the ripples spread out in circles. The water doesn't travel to the edge — it just bobs up and down — but the ripple does. That's a wave: a wiggle that moves across something while the something itself mostly stays put. Sound, light, and even the wave at a stadium all work like that.
A wiggle moving through stuff
A wave is a pattern of disturbance that moves through stuff — water, air, a rope, even empty space — while the stuff itself mostly stays where it is. The wave carries energy and information, not the material. Waves have a wavelength (how far between bumps), a frequency (how many bumps per second), and a speed. When two waves meet they add together; when they hit a boundary they can bounce, bend, or split. Sound is air waves, light is electromagnetic waves, and an earthquake sends waves through the ground.
A wave is a disturbance that propagates through a medium or field, carrying energy and information from one place to another without the medium itself going along for the ride. The water in a pond bobs up and down while the ripple travels outward. Every wave has a wavelength, a frequency, and a propagation speed, and these three are linked by a dispersion relation determined by the supporting system. Waves show characteristic behaviors: they superpose (add up when they meet), reflect at boundaries, refract when entering a new medium, and produce interference and diffraction. Sound, light, water waves, seismic waves, and even quantum probability all share this vocabulary.
A wave is a disturbance that propagates through a medium or field, transporting energy and information across space and time without net transport of the medium itself, with specifiable relations among spatial wavelength, temporal frequency, and propagation speed governed by the system's dispersion relation (the function linking frequency to wavelength). The commitment in calling a phenomenon a wave is that it exhibits the characteristic suite of wave properties — propagation at a definite speed, linear superposition of independent disturbances (waves add), reflection and refraction at boundaries, interference (constructive and destructive overlap), and diffraction (bending around obstacles) — so that wave vocabulary buys predictive purchase rather than mere metaphor. Every wave claim specifies (1) the disturbance quantity that oscillates (pressure for sound, displacement for strings, electric and magnetic field for light, population density for ecological waves), (2) the medium or field that supports propagation, (3) the dispersion relation linking frequency and wavelength, and (4) the regime of validity in which linear superposition holds (small amplitudes, far from nonlinearities). The modern wave equation, originating with d'Alembert's 1747 solution to the vibrating-string problem, remains the canonical departure point for all wave phenomena.
Children (1) — more specific cases that build on this
Wave-Particle DualitypresupposesWave — Wave-particle duality presupposes wave because the dual aspect requires that the entity exhibit characteristic wave properties under wave-context experimental probing.
Wave is not Propagation because a wave is a disturbance that oscillates or repeats as it propagates through a medium or field, transporting energy and information, whereas propagation is the systematic spreading of any signal, effect, change, or condition through a medium without requiring oscillation; waves are propagation with oscillatory structure, while propagation includes non-oscillatory spreading.
Wave is not Flow because a wave transports energy and information through oscillations in a medium or field while the medium itself may remain in place locally, whereas flow is the continuous directional transfer of a conserved quantity (mass, momentum, energy); waves exhibit oscillatory structure, while flow exhibits directional continuity.
Wave is not Resonance because a wave is a propagating disturbance pattern, whereas resonance is the amplification of oscillations when forcing frequency matches the system's natural frequency; waves can occur without resonance, and resonance is a response phenomenon while waves are a transport phenomenon.