HubSpot is a customer platform that unifies CRM, marketing, sales, customer service, and CMS capabilities to help businesses grow. It provides a central contact database, marketing automation, sales productivity tools, customer service ticketing and knowledge base, and a content management system — all connected with reporting and analytics. HubSpot exposes REST APIs, SDKs, and a developer portal for building apps, private integrations, and automation; it also offers modern developer workflows (OAuth2, private app tokens, scopes, and developer test accounts). The platform includes AI-assisted features (content and assistant tools), an app marketplace, and extensible connectors to integrate HubSpot data across systems.