Waves are found everywhere in our daily life. Sound waves, visible light waves, radio waves, microwaves, sine waves, cosine waves, stadium waves, earthquake waves, waves on a string and so on are some of the examples of waves.
Wave has the crest and trough. The crest is the point on the medium that exhibits the maximum amount of positive or upward displacement from the zero position or rest position. The trough is the point on the medium that exhibits the maximum amount of negative or downward displacement from the zero position or rest position.
When two waves travel through the same medium and meet one another, depending upon the medium their effects may vary. Explaining this is the explanation of interference of waves.
When two waves meet while traveling along the same medium where interference occurs, this phenomenon is called wave interference. The interference of waves forms particle in the medium to take a shape and that results from the net effect of the two individual waves. To begin the exploration of wave interference, consider two waves of the same amplitudes are traveling in different directions in the same medium. Consider that each wave displaces an upward 1 unit at its crest and has the shape of a sine wave. As the sine pulses move towards each other, eventually there will be a moment in time when they will be completely overlapped. At that time, the obtained wave shape would be an upward displaced sine pulse with amplitude of 2 units. The figures below depicts the before and during interference snapshots of the medium for two such wave pulses. The individual sine pulses are drawn in red and blue colour, and the resulting displacement of the medium is drawn in green colour.