Waves carry energy and momentum from one place to another without the transport of matter.
A wave is a disturbance of a physical property that propagates, such as deformation, pressure, electromagnetic field and so on. We can associate each type of wave with a field.
We can cite the following example: in the case of the free surface of a liquid, the field is the displacement of each point of the free surface of the liquid in relation to the equilibrium form. It is important to have the physical view of a wave as a physical situation described by a "time-dependent field", that is, a function of time.
Interference is one of the characteristics and unique properties of wave motion.
Unless we explicitly state otherwise, we will make the following assumptions: