Question

what is the meaning of propagation and for what it is used

Answer 1

Vocabulary.com Dictionary

propagation

If your dog is about to have puppies, then she's is engaged in the propagation of dogs, the creation of new life to further the species.

Propagation has two main uses, both having to do with multiplying something. If it's used in relation to creatures, that means that the creatures are multiplying — having kids. A synonym for this is procreation. We also propagate ideas. Use propagation for anything that multiplies and spreads through larger and larger numbers or spaces — from the propagation of weeds in your garden to the propagation of belief in the divinity of snowmen. In physics, propagation is wave movement.