Postman Collections & Environment File

Collections

A Collection is a folder-like grouping of related requests, letting testers organize an entire API's endpoints (or a full test suite) in one place, complete with sub-folders and shared settings.

Environment Files

An Environment is a named set of variables (like base URL, API key, or auth token) that can be swapped in and out — allowing the same collection of requests to run against Dev, QA, or Production without editing each request individually.

Why This Combination Matters

Together, Collections and Environments let a tester maintain one reusable, organized suite of requests that can target any environment simply by switching the active Environment.