PDF (Portable Document Format) is a versatile electronic document format. It was initiated by Adobe and was originally intended for electronic presentation of printed materials. Hence, the tasks of this format follow - storing information about the color scheme and the arrangement of elements, as well as ensuring identical output on different monitors and printers. PDF documents can be opened using the free version of Adobe Reader or a web plug-in that is available for most Internet browsers. In some browsers, in particular, in Google Chrome, this format is supported even without the plugin installed. You can edit PDF files using the paid version of Adobe Reader. Also, there are a huge number of programs for both opening and working with this format, and for converting to other formats.
A JPG or JPEG file is an image file. The reason some JPEG image files use the JPG extension and others the JPEG is explained below, but regardless of the extension, both files are in the same format. JPG files are widely used because their compression algorithm significantly reduces file size, making it ideal for sharing, storing and displaying on websites. However, this JPEG compression also degrades the quality of the image, which can be noticeable if it is highly compressed. Due to its small size, it is in demand among website owners, allowing you to really save traffic. Also often used in digital camcorder memory cards. The JPEG algorithm is best suited for compressing photographs and paintings in which realistic scenes with little color contrast are present.