What is office software?
Office Software is tools to help a user with office related work
at home or at a workplace both for beginners and advanced users.
One of the most used would be Microsoft Office that could include
Word for text, Excel for numbers, Outlook for email and contacts
and other depending on the version and pack you get. Microsoft
Office can be used on both PC and MAC.
Many more exist.
Popular free versions of these would be Libre/Open Office.