What do you do with your leftover cooking grease?

We all (I hope) know not to throw it down the drain or it could congeal and create a clog. Ever since I was a kid we’ve had a grease jar we keep in the fridge. Once it is full it goes in the trash. You?
Grease jar
Toss it outside
Down the drain (oops!)
Something else, please comment
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For example, when you cook bacon or ground beef in a pan, what do you do with the liquid fat (grease) that is rendered?
What do you do with your leftover cooking grease?
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