Anything stored on a computer or sent over the Internet is in a specific format.
Images are no exception, and there are a wide variety of image formats in use today.
Your choice of image format is based on a variety of factors, such as whether you plan on editing the image in the future, whether you want the smallest possible image for downloading over the Web, or what image editing tools you have at your disposal. When you want to save or keep a copy of an image for further editing, you need to pick a format that records the image correctly , without losing any details. These are typically called true image formats. As long as you store your original images in a true image format, you can reedit them later without losing any quality. However, true image formats tend to have large file sizes , making them unsuitable for sending over the Internet.