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
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: