Is the point of the game to walk around and find these animals?
My kids have yet to explain it to me and I have no idea what the game is about.
Yes, you walk around to capture them. I would say you can also drive but that is dangerous unless you have somebody doing the driving for you.
There are also poke stops scattered around, usually by landmarks, statues, etc. At those you can get items like poke balls, eggs, incense, etc. that you use to help catch more and to heal if you battle. I don't know much about how the gyms work but you can battle at those. You can also takeover a gym by leaving one of your pokemon there. There are 3 teams, you have to declare a team to battle at gyms. If the gym is already controlled by your team color, I think it is considered a friendly gym.