What is the purpose of a “Refresh Token”?

Question

I have a program that integrates with the YouTube Live Streaming API. It runs on timers, so its been relatively easy for me to program in to fetch a new Access Token every 5

Answer 1

@Teyam mention SO post Why Does OAuth v2 Have Both Access and Refresh Tokens? but I prefer the another answer there: https://stackoverflow.com/a/12885823/254109

TL;DR refresh_token does not bring increased security. It's for the purpose to improve scalability and performance. Then, access_token may be stored just in some fast, temporary storage (like memory). It allows the authorization and resource server separation, too.