Compare and contrast the functional requirements and non-functional requirements.

Functional requirements and non-functional requirements are two types of specifications that are designed to define a system's behavior. However, they differ in their focus and the aspects of the system they describe.

1. Functional Requirements: These are the primary requirements of the system. They describe what the system should do and include specific functions that the system must be able to perform. For example, if we're talking about a banking application, a functional requirement might be that the system must be able to process withdrawals and deposits.

2. Non-Functional Requirements: These requirements, on the other hand, describe how the system should work. They define the system's performance, security, usability, etc. For instance, a non-functional requirement for the banking application might be that it must be able to handle 10,000 simultaneous users.

In summary, while functional requirements focus on what the system should do, non-functional requirements focus on how the system should perform its functions. Both are crucial for the successful development and operation of any system.