Office 365 is a cloud-based subscription version of Microsoft Office that was launched in 2001. It contains the core Office applications like Word, Excel, PowerPoint, and Outlook. Office 365 is different from previous versions because it is subscription-based rather than a one-time purchase, allows access to the latest features through updates, and is designed to be used online through Microsoft's servers. Businesses of all sizes use Office 365 to equip employees with productivity tools and allow organizations to work more efficiently through intelligent apps and services included in various subscription plans.