What it means
Every WhatsApp message has a lifecycle of states reported back to the sender. Sent means your business platform handed the message to WhatsApp's servers (single grey tick). Delivered means it landed on the recipient's device (double grey tick). Read means the recipient opened the chat (double blue tick, if the recipient has read receipts on). Failed means the message could not be delivered, usually because the number is invalid, blocked, or unreachable.
On the WhatsApp Business API, every state change is also exposed as a webhook event, so your CRM and analytics can record exactly what happened to each broadcast or notification.
Why it matters
Message status is the single best signal of broadcast health. Delivery rate (delivered / sent) under 95 percent flags either a stale list, blocked numbers, or a quality-rating problem. Read rate gives you a true open metric, more honest than email open rate.
For high-stakes broadcasts (price changes, urgent alerts), real-time failure handling matters. You can route undelivered messages to a fallback channel like SMS within minutes, instead of finding out days later.
Example
A property agency broadcasts a launch announcement to 4,200 contacts. Within the hour: 4,150 delivered (98.8 percent), 3,710 read (89 percent of delivered), 1,820 replied. The 50 failures are flagged automatically, and the team triggers an SMS fallback for those numbers.