Office 365 is Microsoft productivity software that is available on a pay-as-you-go subscription service, either monthly or annually. It includes the typical programs in the Office suite with the addition of some Internet-enabled services.
Office 365 is available for PCs or Windows tablets, as well as Macs and iPads. Users do not need to be connected to the Internet to use Word, Excel or PowerPoint because these programs are installed on their devices. Internet access is required for the other programs that are offered as Web services and to keep the subscription and software up to date. Office 365 plans are available for personal and business use.