All inclusive honeymoon! What does that really mean?

Hello! We were originally thinking about skipping our honeymoon until next year due to financial reasons but then some of my coworkers suggested doing a all inclusive honeymoon (and we are under budget so we thought why not,)They said you actually don't spend as much since your drinks and food are included. We are thinking about booking Excellence Resort and I'm wondering what does " all inclusive" really mean? Is there a limit of drinks and food or is it like a buffet all you can eat kinda thing? Is there hidden costs? Do we tip? I looked online but it didn't say much. So my questions....What is your experience with all inclusive resorts ? Any tips or advice? TIA!