Sometimes when you have a document (or a spreadsheet or presentation) you want to send it to people as a PDF. This is helpful because it means it is in a read-only format and typically has a smaller file size. Given the prevalence of PDF as a standard format for exchanging files many applications let you save or export the file as a PDF.
Microsoft Office does exactly this and without needing any extra software you can create a PDF file. Whether it is a document, spreadsheet, or presentation you can in a couple of quick clicks get yourself a PDF file. There are two ways to achieve this:
File Export: From the File menu click on the export option (in some versions of Office this option is called save & send. This will provide a couple of options for your file, one of which is PDF file.
File Save: When you save a file in Microsoft Office you can choose the file format. This enables you to save in numerous formats (Office 97, plain text, etc). Simply select PDF then finish saving as per usual. NB: If you've already saved your file as a document then you will need to use the Save As option.