Why do I have a folder on drive C, called program data?

I'm running out of space on my C drive and watch programs that I can move drive D, but looking at the items on the C drive, there is this folder named Program Data, which I don't remember being on the windows or even on the C drive of last year. The file seems to be a duplicate of some of the programs in the Program Files folder. Can someone tell me if it is safe to remove this folder? The size of the file is 1.65 GB.
Would appreciate any help that can be given.
Thank you
Concerning
John

John

It is absolutely necessary.  Removing it would make most apps to stop.

There are other ways to gain back space like delete temporary files, reducing the size of your pagefile, UN-installing apps you don't use and remove the accessories (such as games) that you do not use.

IF the shortage is radical you can even remove unused fonts (make sure that they are not used in first), etc.

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