| These are the needs that the end-user specifies as essential features that the SYSTEM should provide. | These are the quality requirements that the system must meet in order to fulfil the project contract. |
| The user specifies the functional requirements. | Technical individuals, such as architects, technical LEADERS, and SOFTWARE engineers, specify non-functional requirements. |
| Functional Requirements are mandatory. For example, the client might want certain mandatory changes in UI, LIKE dark mode. | Non-functional requirements are not Mandatory. For example, the requirement to enhance readability is non-functional. |
