What are all the hard drive icons on my desktop from app installations?

Most of the apps I have installed leave a new hard drive icon on my desktop, like these. Obviously the Macintosh HD is an good one to keep, but the others just keep accumulating and I find that to be a problem.
What are these?
What purpose do they serve?
Can I delete them?
If no delete, can I hide them?
Thanks

1. Mounted disk images.
2. They contain the software or its installer. The dmg format doesn't require separately storing the decompressed version of the data on the computer.
3. Yes.
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