Software engineering requirements refer to the specifications, functionalities, and constraints that a software system must satisfy to meet the needs of its users and stakeholders. These requirements serve as the foundation for the design, development, testing, and maintenance of the software product. Here's a breakdown of the types of requirements commonly addressed in software engineering:

1. Functional Requirements: These specify the behavior of the software system, describing what tasks the system should perform. Functional requirements are often expressed as use cases, user stories, or functional specifications.

2. Non-Functional Requirements: These define the quality attributes or constraints of the system, such as performance, reliability, scalability, usability, security, and compatibility. Non-functional requirements are crucial for ensuring that the system meets user expectations and performs effectively in its operational environment.

3. User Requirements: These represent the needs and expectations of the end-users or stakeholders who will interact with the software system. User requirements focus on the features and functionalities that users require to accomplish their tasks efficiently and effectively.

4. System Requirements: These specify the capabilities and constraints of the overall system, including hardware, software, networking, and other infrastructure components. System requirements help ensure that the software can be deployed and operated successfully in its target environment.

5. Interface Requirements: These describe how the software system interacts with external systems, interfaces, or users. Interface requirements include protocols, data formats, communication mechanisms, and user interface design guidelines.

6. Performance Requirements: These specify the performance characteristics of the software system, such as response time, throughput, and resource utilization. Performance requirements ensure that the system meets acceptable levels of speed and efficiency under various conditions.

7. Security Requirements: These address the protection of the software system and its data against unauthorized access, data breaches, and other security threats. Security requirements encompass authentication, authorization, encryption, and other security measures.

8. Regulatory Requirements: These include legal and regulatory standards that the software system must comply with, such as industry regulations, privacy laws, and accessibility standards. Regulatory requirements vary depending on the domain and geographic location of the software deployment.

9. Usability Requirements: These specify the ease of use, learnability, and user experience of the software system. Usability requirements focus on making the system intuitive, efficient, and satisfying for its intended users.

10. Maintenance and Support Requirements: These address the long-term maintenance, support, and evolution of the software system. Maintenance and support requirements ensure that the system can be updated, patched, and extended over time to address changing needs and technology advancements.

By carefully eliciting, analyzing, and documenting these requirements, software engineers can effectively plan, design, and develop software systems that meet the needs of their stakeholders and deliver value to users.