Why does the "alert" noise sound when I open applications?

When I first got this mac, it did not sound when I opened applications, so it's definitely not normal.
I also do not think that this is a type of setting that can be changed, and if it was, I surely did not set it (and nobody else has access to my computer)
I don't know if this is a virus?

Hi,
Not quite the same issue as yours... But I sometimes get the Alert sound when closing Multiple Windows...
What I do is simply Log Out and then Back In again and it's gone...
( I did Bug Report this to Apple Months ago... )
Cheers,

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