Waterfall is putting all your tasks on a calendar for the next year and then moving them every day to reflect changing reality. You spend most of your time moving tasks around and very little accomplishing anything.
Agile is making a prioritized to-do list and checking things off as you do them and adding things as you discover them. You spend most of your time doing stuff and very little managing your list.
Scrum is a flavor of Agile that provides one fairly specific way to manage your to-do list.
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Waterfall is putting all your tasks on a calendar for the next year and then moving them every day to reflect changing reality. You spend most of your time moving tasks around and very little accomplishing anything.
Agile is making a prioritized to-do list and checking things off as you do them and adding things as you discover them. You spend most of your time doing stuff and very little managing your list.
Scrum is a flavor of Agile that provides one fairly specific way to manage your to-do list.