What is JPG file?
File extension JPG is related to JPEG (Joint Photographic Experts Group) image file format. It is mostly used for bitmap images (photos, pictures, etc.).
Image files that employ JPEG compression are commonly called JPEG files. Most image capture devices (such as digital cameras) and most image editing software programs that output JPEG files are actually creating a file in the JFIF and/or Exif format．
The most common filename extensions for files employing JPEG compression are .jpg and .jpeg, though .jpe, .jfif and .jif are also used. It is also possible for JPEG data to be embedded in other file types - TIFF encoded files often embed a JPEG image as a thumbnail of the main image.
How to open JPG files?
These instructions are for opening a file with a name ending in .jpg. JPG is a graphics file format. When the file is opened, you should see a picture.
If the jpg file is attached to an e-mail you should be able to click twice in quick succession on the file name or file icon inside the e-mail. If it's saved on the computer, you'll need to navigate to it's location, then double click on it.
If the jpg file didn't open right away, you will be presented with a window asking what program you what to open the jpg file with. To the right of open with there will probably be a browse button. Click on the browse button.
You can also right-click on the jpg file, and choose Open With>>>Choose Program....
Choose a program you want to use to open the file from the list.
All internet browsers will open jpg files. You are reading this now using an internet browser. Some common browser names are Firefox and Internet Explorer.
How to edit JPG files?
Edit JPG file using Microsoft Paint
Microsoft Paint is embedded in the Windows. It can do many simple tasks. You can open jpg file by right-click on the file and choose Edit.
Edit JPG file using GNU GIMP
GIMP is a free and open source image editor that can handle your jpg file perfectly.
Edit JPG file using Adobe Photoshop
Adobe Photoshop CC is a paid software most used by professional designers.