The traditional ‘waterfall’ uses an agreed scope to create a time and resources plan. Agile establishes the resources and time which ultimately drive scope. There will be a number of time and cost delivery windows, sprints, through which the project will evolve.
An agile environment establishes a minimum viable product (MVP); the core project deliverable to trigger the start of a delivery. This is likely to change as the project team realises other opportunities or benefits that become available throughout each sprint.