• Functional Requirements: These are the core features that the system should provide that the end user directly requests. As part of the contract, all of these functionalities must be included into the system. These are expressed or described as input to be delivered to the system, operation to be conducted, and expected output.
• Non-functional requirements: These are the quality limitations that the system must meet in order to meet the project contract's criteria. The importance of these aspects, as well as the amount to which they are implemented, varies from project to project. Non-behavioral requirements are another name for them.

Read More: What is cohesion?