CRM (Customer Relationship Management) software is a single system that holds every lead and customer your business talks to — where the enquiry came from, who spoke to them last, what was quoted, and what happens next.
Without it, that information lives in four places: one salesperson's phone, a WhatsApp group, an Excel sheet nobody updates, and somebody's memory. Leads go cold because no one owned the follow-up. Managers can't answer basic questions like how many enquiries came in last month or which salesperson is converting.
A CRM puts all of it in one place, with reminders so follow-ups happen on time and reports so you can see what's actually working.