 People make decisions every day. For example, before you go outside, you kind of have an if statement that says, if it's raining, then I need to get my jacket. And computers are amazing once you decide those kinds of statements that they can reliably execute those things at unbelievable speed. And so a computer program really is a little bit of math and we hand some if statements where the decision gets made. An if-else statement is a decision between two things. So say, for example, if it's a weekday, it's time to go to school. Otherwise, you can stay home and have fun.