Disjunction is a big word that means "or" in grown-up talk. When we have two things, we can say that they are either the first thing "or" the other thing. It's like having two toys and saying, "I can play with either my doll or my truck."
In math, disjunction means the same thing. We use it to help us figure out if something is true or false. So if we have a statement that says "I have a red shirt or a blue shirt," it means we could be wearing either a red shirt or a blue shirt – but not both at the same time!
Disjunction can also be used to link two statements together. If we say "I like pizza or I like hamburgers," this means that we have two separate statements that are both true. We can also say "It is raining today or it is sunny," even though those two statements are opposites, because one of them has to be true – either it's raining, or it's sunny.
Overall, disjunction helps us understand that things can be one thing or another. It's a way of describing choices or possibilities, and making sure we don't get confused about what's true and what's not.