Office is related to Microsoft Office applications. You have chance to open these files with Microsoft Office.

Microsoft Office: It is an advanced system which used for editing various documents and tables.
Office package consists all these:

Word: Text editing software.

Excel: Table and graphic editing software. 

Outlook: Email software.

Access: Database management software. 

Power Point: Presentation software.

You can only install Office with a Cd. However, you have some other options. For example, doc and docx kind of files can be opened Office doc Viewer. And, Xls and XLSX kind of files can be opened Table Viewer software. You can get those free via internet. 

What to use office

Microsoft Office

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You can check related links about office fileextension.