JEPG is a very popular algorithm of lossy compression for digital pictures. Some people call this format as JPG because JPEG has the same extension. This method provides high-quality compression. However, it takes an amount of picture weight. You can make a small image but it will be a low-quality picture.
JPG files are not unique. JPEG is the most popular format for images. So, you can open these files using standard viewers or Microsoft Paint which is included in Windows systems. However, some users need a convenient way to view a huge collection of pictures on PC. In that case, you should pay attention to image viewers. There are no any problems with an installation of these utilities. The most of them are freeware. And they can easily work with JPG format.
Some of these programs work as multimedia combines which allow you to play videos and music files. They are very easy in use. They are known for interface features that simplify picture navigation and browsing. For example, IrfanView and FastStone Image Viewer show a great performance. These utilities are very fast and have a simple interface. Besides, they have some editing tools which allow you to enhance your photos without opening other software.