What is a CRM?
A CRM keeps contact details, messages, proposals, and next steps together.
CRM stands for customer relationship management. It usually means software for keeping customer and prospect relationships organized.
For prospect follow-up, you need to know who the prospect is, what went out, what happened last, and when to follow up. A smaller business may already have all of that in regular email and a spreadsheet.

Two places the same essentials can live
When a CRM becomes useful
A CRM helps when prospect volume grows or conversations become hard to find. It also gives several people one record to work from.
If email and a spreadsheet already give you those facts, you don't need a CRM for this work. I can work with that setup; moving into a CRM or cleaning up an old one would be separate work.
Where this shows up in practice
- Prospect follow-up
Use the contact details, proposal or estimate, last conversation, and follow-up date already in your current setup.