What is a dmg file?

What is a *.dmg file?  I am showing one in my Finder called ABEIDSNCS4_LS1.dmg and it's an image file.  My concern is that the size is 1.16 GB. What could this be and can I delete it?
Thank you.

.dmg files are Disk Images. Basically they act like a separate volume on a hard drive. Often when you download an application from the Internet it comes on a disk image file. Once you have run the installer, you can delete them by dragging them to the Trash and emptying the Trash. Another way would be to hold down the control key on your keyboard when you click on the .dmg file and select Move to Trash from the menu that appears. Again you'll want to empty it.
Best of luck.

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