List the main types of software requirements.

The main types of software requirements are divided into several categories:

1. Functional requirements — describe what the system should do, what functions and tasks it should perform.
2. Non-functional requirements — define the qualities of the system, such as performance, security, usability, reliability.
3. Business requirements — reflect the goals and objectives of the business that the system should support.
4. User requirements — describe the expectations and needs of end users.
5. Technical requirements — constraints and standards related to architecture, platforms, integrations.

For example, a functional requirement: "The system must allow users to register with email confirmation"; a non-functional requirement: "The system response time should not exceed 2 seconds".