How does OAuth work?

[Brian]

Does anyone know of any plain English links to explain how OAuth works in Jira?  

I created an application link in our Jira server (7.13.0) and he was able to create a public/private key and using Python wrote a script to use the API to create an issue in a test project.

I don't understand why his name appears as the Reporter of the issue though.  Since he's developing a way for 1 system to automatically create issues based upon certain conditions in that system, we don't want his name to be the reporter for all these issues.

Any links to any resources/videos/discussion threads would be much appreciated or a simple explanation here if you have time.