Final answer:
Agile and waterfall development differ in terms of flexibility and communication.
Step-by-step explanation:
Agile and waterfall development are two different approaches to software development. Two critical areas that differentiate Agile from waterfall development are flexibility and communication. In Agile development, there is a focus on adaptability and responsiveness to changes in requirements. This is achieved through iterative development cycles and regular communication among team members. On the other hand, waterfall development follows a linear approach with a fixed set of requirements, which makes it less flexible and relies less on continuous communication.