Almost everyone of us have heard about PDF which is also known as the Portable Document Format which was created by Adobe Systems to represent documents in a device-independent environment. PDF is a document format that is widely used. Before the creation of Foxit PDF Reader the popular source of reading PDF document was Adobe Acrobat Reader which uses a enormous amount of memory (that is the one reason I uninstalled it and am sticking with Foxit) and is also quite slow at times.