What is a Activision account for modern warfare?

Managing Your Activision Account

I'm trying to make an activision account and it keeps saying invalid user. But doesn't ask for a username. Solution? : r/Warzone

I started playing the beta today and Activision automatically signed me in to some random person's account. Has this happened to anyone else? : r/modernwarfare

My Activision account was hacked

1.5K Activision Reviews activision.com @ PissedConsumer

Warzone Mobile Stuck On Logging In To Activision Account Fix - GINX TV

Understanding How Long an Activision Account is Under Review

Call of Duty: Modern Warfare Requires an Activision Account For Cross-Play

How To Close An Activision Account When Someone Dies

How To Create Account in COD Warzone Mobile Activision Account Sign in Cod Warzone Mobile, Sign up