What do channel points bring to Twitch?

Question is up there.

Some streamers can be used to buy alerts from them
Alert = sound selected by the streamer that will be played after the purchase

The channel points bring different things with them. Without requesting a donation, the streamer has the opportunity to reward long-time viewers who watch for a long time with various things (can set streamer himself). For example, with some streamers with channel points you can unlock and change emotes, highlight messages, have them marked on an Ig picture, suggest the next game, etc.

Thank you😄