HubSpot is a CRM platform with marketing, sales, service and CMS hubs built onto a shared contact database. The free CRM is genuinely useful — contacts, deals, pipelines, forms and email — and the paid hubs add automation, sequences, reporting and attribution as you grow.
It suits growing teams that want sales and marketing in one system with no integration glue. The catch is well known: per-seat and contact-tier pricing rises sharply once you unlock the hubs. Sales-only teams often do fine with Pipedrive or Attio.