Also known as a yard sale, estate sale, etc. In the UK they're additionally known as car boot sales and jumble sales.
For real-life purposes, garage sales are events where owners get rid of all the useless junk they couldn't use before and buyers pick up some trinkets cheap. You can find puzzles, books, adorable clothes for your nephew, even the occasional working appliance.
In fiction, garage [...] [tvtropes.org]