Around her six months of age, you will notice your baby is playing a new game.
“drop things on the floor.”
It may seem like a simple passing of time to you (and also a source for a sore back), but she is achieving a lot with her throwing.
She’s learning about cause and effect.
When she gets the response she expects (you pick up the toy or whatever she has dropped and given it to her again), it reinforces her understanding of how the world works.