Questions about how to best cut plant branches, vines or stems. For questions about root pruning please use the [root-pruning] tag.
Pruning is performed primarily to produce a better shaped plant, or to promote new growth of branches or flowers.
In many cases, prunings (i.e. the discarded branches) can be used as cuttings to create new plants.
In rare situation even roots could be pruned to remove rotten parts, or to be able to remove a plant from an outgrown pot, etc. For questions like these use the root-pruning tag.