You can open a PDF file directly online to read and print it when you use the left mouse button (Microsoft Windows users) or the main mouse button (Apple Macintosh users). Once you open the PDF file it will be displayed by programs such as Adobe Acrobat Reader.
Adobe's Acrobat Reader software enables users to read, search and print documents in the Portable Document Format (PDF). It's free. Download Adobe® Acrobat® Reader