Architecture practices work on long timescales. A conversation at an industry event can turn into a fee three years later, and a client who commissioned a scheme in 2019 may well be the one appointing again next year. Very little of that history is written down anywhere useful.
A CRM (customer relationship management system) gives the practice a shared memory. Clients, developers, contractors, consultants and local authority contacts all sit in one place, with the projects, bids and conversations attached to them.
It doesn't replace your project or resourcing tools. It covers everything around the work: where the next commissions are coming from, which relationships are worth nurturing and what was discussed the last time someone spoke to them.
For most practices, a CRM is where the following live: