Meta's green, yellow or red score for a WhatsApp business number, based on how customers have reacted to its recent messages.
Every business number has a quality rating: green (high), yellow (medium) or red (low). Meta calculates it from recent customer signals, mainly how often people block or report your messages, and the reasons they give.
The rating affects what you can do. A falling rating can stop your messaging limit from rising, and a persistently low one can lead to restrictions on the number. It also tends to fall fastest right after a large, poorly targeted broadcast.
Protect it the same way you protect any customer relationship: message only people who opted in, keep content relevant, do not send too often, and make opting out easy. If the rating drops, pause marketing campaigns, review the most recent templates and audiences, and let it recover before sending more.