What is Microsoft 365?

Microsoft 365 is a cloud-connected office suite and productivity platform that combines Word, Excel, PowerPoint, Outlook, OneNote, OneDrive, and Teams with storage, security, and Copilot features in one subscription. It is used by individuals, families, and businesses that need to create documents, manage email and calendars, share files, meet over video, and collaborate in real time. Microsoft positions it across personal and business plans, and the product pages highlight widely used customers and scale signals like hundreds of millions of users across Microsoft’s productivity ecosystem.

Microsoft 365 grew out of Office, then expanded beyond desktop apps into a subscription service with web and mobile access, continuous updates, cloud storage, and connected collaboration tools. What started as a bundle of word processing, spreadsheets, and presentation software is now a broader work hub that also includes Outlook, Teams, Defender, OneDrive, and AI-assisted creation and editing.