Note: I am putting these here because students have asked them in the past, this is not a reflection of what will be on quizzes.
A: Accessors (Get Methods) are used to look at only one value in an object. Before we used toString to look at all of the values but Accessors give us only one at a time, which is useful when we want to compare those values to other values or when we just want to know one thing and not all of the things.
Mutators (Set Methods) are used to change individual values in an object. If we didn't have mutators we wouldn't be able to change or update anything in the object.
A: So far in class we have been dealing with small amounts of data, as the data your program is dealing with gets bigger and bigger it is useful to be able to group it together.