Here's a breakdown of the key points:

* Disturbance: A wave is caused by a change or variation in a medium, like a vibration, oscillation, or pulse.

* Travels through a medium or space: Waves need a medium (like water, air, or a string) to propagate, except for electromagnetic waves which can travel through a vacuum.

* Transfers energy: Waves carry energy from one point to another. Think of a pebble dropped in a pond – the wave carries the energy from the impact outward.

* Doesn't transfer matter: The particles of the medium only move temporarily as the wave passes through. They don't travel with the wave itself.

Examples of waves:

* Water waves: These are caused by wind or disturbances on the water's surface.

* Sound waves: These are vibrations that travel through air, water, or solids.

* Light waves: These are electromagnetic waves that can travel through a vacuum.

* Seismic waves: These are caused by earthquakes and travel through the Earth.

Key characteristics of waves:

* Amplitude: The maximum displacement of a point on the wave from its resting position.

* Wavelength: The distance between two consecutive points on a wave that are in the same phase.

* Frequency: The number of waves that pass a fixed point in one second.

* Speed: How fast the wave travels through the medium.

Understanding these basic concepts helps us grasp how waves behave in different situations and how they are used in various technologies.