Twitch alerts became part of live streaming as creators needed a clear way to acknowledge support in real time. A follower, subscription or donation alert lets viewers hear the moment, even when they are not watching closely, and gives the streamer a prompt to respond by name. Free alert packs shared online made this style accessible to small channels, which could add a polished cue without commissioning custom audio. That accessibility keeps this kind of alert common in gaming, chatting and charity streams, where frequent support needs a recognisable reward.