can a bonsai tree be started with just a branch?

I hope that someone can help me. i want to start a bonsai tree and i’ve been told that i can do this by cutting off a small branch from a bush or a very young tree. is this true? please respond. thanks.

i understand that you can use rooting powder to encourage the growth of roots on cuttings. the important thing though is that you have to have a smooth cut to work with. a jagged cut will just rot in water and also harms the tree you take it from.