What does interpolation physically mean in signals and systems?

pradeep madhavhi
what does interpolation physically mean in signals and systems

Interpolation can be said as missing of empty spaces with aliasing when upsampling is done in a linear process of digital signal processing, in a sense with is different from mathematical term that is to create point in between the samples of the original range.

For more you can refer to Discrete Time Signal Processing by Oppenheim.