Technical

Overlay

The graphics layered on top of your gameplay — webcam border, alerts, recent-follower box, chat box, etc.

Related terms

Alert
An on-screen pop-up (often with sound) that fires when someone follows, subscribes, or donates.
Encoder
The software or hardware that compresses your video to send it online. 'x264' uses your CPU; 'NVENC' uses an NVIDIA GPU.