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WhatsApp platform

Conversation window

The conversation window is the period, 24 hours on WhatsApp, Instagram, and Messenger, during which a business may send free-form messages after a customer's most recent message.

Also called24-hour windowcustomer service windowmessaging window

Once it closes, WhatsApp allows only pre-approved message templates, and Instagram and Messenger allow almost nothing without a special permission from Meta. Every platform in this category is bound by it equally, because the rule is Meta's. A product that appears to sidestep it is either using a mechanism with conditions attached or is risking your account.

Worth knowing alongside it.

Message template
A message template is a message format submitted to Meta for review in advance, which a business may then send to a customer outside the conversation window with variables filled in.
Session message
A session message is a free-form reply sent inside the conversation window, written in whatever words you like without needing Meta to approve it first.
Human agent tag
The human agent tag is a Meta feature that extends the reply window on Instagram and Messenger for conversations a person is actively handling, beyond the standard 24 hours.