IBM Notes
IBM Notes (formerly Lotus Notes) is a collaborative client-server software platform that provides email, calendaring, contact management, and application development capabilities. It integrates with IBM Domino Server to enable secure messaging, workflow automation, and custom business applications through a proprietary database system. Historically, it was widely used in enterprise environments for groupware and business process management.
Developers should learn IBM Notes when working in legacy enterprise systems, particularly in industries like finance, government, or large corporations that still rely on it for critical workflows and data management. It is useful for maintaining or migrating existing Notes applications, integrating with Domino databases, or understanding collaborative platform architectures in on-premises environments. However, its relevance has declined with the shift to cloud-based solutions like Microsoft 365 or Google Workspace.