My personal iPad:
Reading email, browsing the web, playing music, catching up on TV etc, a few games, light photography, reading books/magazines, reading/viewing class materials, journaling, making travel plans, video chats with the family, organizing a recipe database to replace scads of photocopies, cards etc
And so on. I also have an older iPad that is my home remote that controls my Apple TV, Nest, lights etc.
My work iPad.
Reading emails, chatting with other units filming at different locations, reading scripts, viewing location photos and videos, shooting and organizing hair and makeup shots for continuity notes, writing up call sheets, viewfinder, logging shot details, filming and editing on the fly behind the scenes bits, showing shot renders to the actors for stunt scenes and so on.