Is there a way to block computer access with a password?

After years of owning my Imac, I find that I need to put some sort of security password on it to keep others from accessing it when I'm not around. I know there must be a very simple way to do this, but I can't figure it out.Please help!

If you are the only user of the machine and prefer to not shut it down frequently, perhaps setting a password requirement to come out of screensaver or sleep is the solution. As Howker suggests, this setting can be made in System Preferences > Security & Privacy > General.
In conjunction with that, you can set a hot corner to quickly activate the screensaver whenever you choose, such as when you will be leaving your computer for a while. Those can be set in System Preferences > Desktop & Screensaver.

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