Swimming is the self-propulsion of a person through water. I like to swim in a swimming pool.
I'm not really good at swimming. Could you give me any advice about it?
People can hold their breath underwater. So, when you swim you just hold your breath then go up for air. If you breath in water it hurts and could make you pass out.
Yeah I've done that before not much fun. What are some different ways to swim?
I don't know different ways but I know you can go free diving which is diving like a normal diver just without the apparatus.
Wow! That sounds really intense and scary!
Yes, a lot of people free dive to see and interact with the environment right underneath the surface. Sometimes they can get caught in a current and run our of breath and have to be saved.
Yeah I would definitely not do that. Don't they catch fish by free diving too? 
Spearfishing is ancient method of fishing that uses a spear to stab the fish. You could that while free diving.
That's interesting I definitely want to know more!