Can you explain what a Collection Runner in Postman is and what it is used for?

Collection Runner in Postman is a tool for sequentially executing a set of requests grouped into a collection. It is used for:

• Automating the execution of a series of API requests
• Testing multi-step scenarios
• Load testing APIs (with the ability to set the number of iterations)
• Passing data between requests via variables

For example, you can create a collection of requests for user registration, authentication, and data retrieval, then run them all in sequence with different data sets to test various scenarios.

This is convenient for automating testing and integration testing of APIs.