In WhatsApp CRM, a follow-up is a step tied to the lead's status. When a lead reaches a status such as "quote sent" or "site visit booked" and then goes quiet, the next step is scheduled. Depending on what you choose, that step is a reminder to the rep, a message to the lead, or both.
We set the sequence with your sales head. A typical one for a B2B quote: a reminder to the rep after two days, a polite check-in template to the lead after four, and a final message a week later asking whether to close the enquiry. Your sequence will be different, and it should match how your best rep already works.