Can I delete downloaded apk's?

[Howdydoesit]

Tried a couple different searches and couldn't come up with anything, but this should be a pretty straight forward question.

When I download an apk file onto the sd card and perform a manual install, is it safe to move and/or delete the apk files from the download folder or are they needed for the app to run?

Thanks

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[cpjr]

After the app is installed they are no longer needed.

 

[DF Smod]

Deleting them is harmless - the copy of the apk on your SD card is not needed for the application to run