Physically, what does the usage of two variables mean for convolution

1. What is the physical meaning of convolution of two signals?
2. What is the physical significance of convolution?
3. What is the use of convolution of two sequences?

What is the physical meaning of convolution of two signals?

Convolution is a mathematical way of combining two signals to form a third signal. It is the single most important technique in Digital Signal Processing. Using the strategy of impulse decomposition, systems are described by a signal called the impulse response.

What is the physical significance of convolution?

Convolution is a mathematical tool to combining two signals to form a third signal. Therefore, in signals and systems, the convolution is very important because it relates the input signal and the impulse response of the system to produce the output signal from the system.

What is the use of convolution of two sequences?

The convolution of two finite sequences is defined by extending the sequences to finitely supported functions on the set of integers. When the sequences are the coefficients of two polynomials, then the coefficients of the ordinary product of the two polynomials are the convolution of the original two sequences.