.dmg on desktop

When I download things like Sibelius Scorch, I find an icon on my desktop that looks like the hard drive. It will be labeled as InstallScorch.dmg, or whatever I have downloaded.dmg. This is true with many of the things I download. My desktop is becoming quite covered with these .dmg icons. Are these something that I need, or after installing the folders etc. can they be deleted? If I need to keep them, is there somewhere else I could put them on the computer so I don't have my desktop cluttered with them?
Thanks for any help

Hello Kaye.
When an application is provided/distributed as a
bundle which is downloaded as a .dmg file which is
short for disk image, double-clicking on the
downloaded .dmg file mounts the disk image on the
Desktop with an icon that looks like a hard drive. To
actually install the bundled application on your hard
drive requires dragging the application from the
mounted disk image to your Applications folder which
copies the application from the mounted disk image to
your hard drive.
When finished, drag the mounted disk image to the
Trash can in the Dock to unmount the disk image or
with the mounted disk image selected, at the Finder
menu bar go to File and select "unmount" and the name
of the mounted disk image. You can also unmount a
mounted disk image via the Finder Sidebar.
You can then delete the downloaded .dmg file.
Thank you Allan. This helped me solve an identical issue!

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