Postman Collections are a group of saved requests you can organize into folders.
Every request you send in Postman appears under the History tab of the sidebar. On a small scale, reusing requests through the history section is convenient. However, as your Postman usage scales, it can be time consuming to find a particular request in your history. Instead of combing through your history section, you can save all your requests as a group for easier access.
Let's review how to send a basic request and create a new collection.
Enter a request in the request builder and click the Save button to open the SAVE REQUEST modal.
Save this request to an existing collection, or create a new collection by entering a collection name, and then click the Save button.
Congratulations! You can see all of your collections under the Collections tab of the sidebar on the left, as illustrated in the screen below: