In physics, interference refers to the phenomenon in which two waves superpose onto each other, resulting in a wave of greater, lower, or the same amplitude. Interference usually occurs between waves that are correlated or coherent with each other with the same or nearly the same frequency. It can be observed with all types of waver, for example, electromagnetic (light is electromagnetic wave), acoustic, surface water or matter waves.

Here is a simulation that helps you to visualise the interference of different types of waves.