CREATIVE MODE
Creative mode is a mode in minecraft that gives you infinite health, blocks, and the ability to fly. In creative mode you can do things like this. It is pretty fun. Also, hostile mobs don't attack you.
SURVIVAL MODE
In survival mode, you collect resources and survive by building a shelter. You also have hearts( lives) that you must keep as full as possible. To do that, you must collect food, which keeps your hunger bar up. When your hunger bar is full, you start regaining health.