What is convolution example?
The convolution can be defined for functions on Euclidean space and other groups (as algebraic structures). For example, periodic functions, such as the discrete-time Fourier transform, can be defined on a circle and convolved by periodic convolution. (See row 18 at DTFT ยง Properties.)
Why do we calculate convolution?
Convolution is important because it relates the three signals of interest: the input signal, the output signal, and the impulse response.