Glossary
JPEG (.jpeg or .jpg) files follow the standards set by the Joint Photography Experts Group. You can use JPEG files as bitmaps.
These files use a variable compression method that is called lossy compression because of the loss of image quality as you increase the compression. However, the JPEG compression scheme works well and you can sometimes compress the file up to 200:1 without severe loss of image quality. JPEG is consequently a popular format for posting image files on the Internet for minimum file size and minimum download time.