Types of Requirements

Business Requirements
Stakeholder Requirements
User Requirements
Program Requirements
Project Requirements
Process Requirements
Management Requirements
Enterprise Requirements
Solution Requirements
Product Requirements
System Requirements
Software Requirements
Change Requirements
Regulatory Requirements
Quality Requirements
Functional Requirements
Non-functional Requirements
Usability Requirements
Indirect Requirements
High-Level Requirements
Detailed Requirements
Information Requirements
IT Requirements
Data Requirements
Design Requirements
(non-)Technical Requirements
Testability Requirements
Security Requirements
Documentation Requirements
Implementation Requirements
Requirements Specifications
 
And there are many more  ...