Just pressing PrtScn copies the entire desktop to your clipboard, which has to be pasted into Paint, or some other image handling program, to be accessed. Alt+PrtScn copies the active window to the clipboard.
To take a screenshot on Windows 10 or Windows 11 and automatically save the file to the Screenshots folder, press the Windows key + PrtScn. Your screen will go dim and a screenshot of your entire screen will be saved to the folder.
Quick tip: You can find the Screenshots folder by opening File Explorer (press the Windows key + E) and clicking Pictures in the left side panel (navigation pane). If you have OneDrive enabled, the screenshot will be saved there as well.
Well, for me, just PrtSc by itself only copies to the clipboard. You then have to paste the image somewhere to save it. If not, every time you hit PrtSc again, it overwrites what’s in the clipboard.
Win+PrtSc OTOH saves the image as a separate .png file to the \Pictures\Screenshots folder every time you use the command, no pasting required and no overwrites.