Hello guys, I need your help.

I don’t understand a concept of «contract balance» and «message balance» from the documentation https://ton.org/docs/#/smart-contracts/tvm_overview?id=initialization-of-tvm

I understand what is «balance» in common life. Like a bank account balance. The amount of funds that I have accumulated and which I can spend to something.
But what is message balance?
I suppose that it is a max limit of grams that i can place in store_grams() function. Am I correct? If so, what the difference with contract balance?