Autumn is almost here, which means the birds are migrating, insects are dying off, the Dragonflight beta is in full gear, and Diablo 4 will soon be starting closed beta testing.
Some games, like Diablo 2: Resurrected, Diablo 3, and World of Warcraft have PTRs where they can test their changes out, put new content up for players to interact with said content, and otherwise perform the Public Test that PTR -- Public Test Realm -- stands for.
The World of Warcraft: Battle for Azeroth alpha test has started and the first batch of testers are receiving their invitations this afternoon.
The really fascinating thing (to me, at least) about an alpha or beta test is getting to see iterative changes.
The Legion alpha is in full swing which means we're getting tons of data about this expansion to be.