01What it is
In plain words.
A CRM is the one place a company keeps everything it knows about the people it sells to: who they are, what was said, what was offered and what happens next.
A sales team without a CRM runs on memory, inboxes and a spreadsheet that one person understands. Leads are followed up twice or not at all, a deal stalls and nobody notices for a month, and when a salesperson leaves, their customers leave the company's knowledge with them.
An off-the-shelf CRM solves that for a company that sells the way the product assumes. A custom CRM is for the company that does not: long, technical sales, dealer and distributor networks, sales tied to stock or production, or a process the team already runs well and does not want bent to fit a tool.