Application suite from Microsoft which includes always Word, PowerPoint and Excel. Depending on what edition of Microsoft Office you have you can also have OneNote, Outlook, Publisher and Access.
Recent Versions of Microsoft Office
Stand-alone license/version for Windows
Subscription based license/version for Windows and MacOS
In addition to the stand-alone Office installations/versions Microsoft also offers a subscription license called Microsoft 365. Microsoft 365 installations offer continues updates to the latest Office version. Although the newest stand-alone versions usually offer the same features as Microsoft 365 they are two software products develop separately.
Microsoft 365 also incorporates all of the cloud-based "software as a service"-products like onedrive etc. Usually, with more features when compared with their free counterparts.
Stand-alone license/version for MacOS
There are also versions for OS X, generally grouped under office-for-mac, or individually:
Applications Included in Microsoft Office
Unless your question pertains to Microsoft Office as a whole or the integration between Microsoft Office programs, it is best to use one of these tags instead: