system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: How does a Zamboni work?
gpt
Moving front to back on modern resurfacers: Spray water on ice to loosen dirt. Large blade scrapes up top layer of ice using mostly the weight of the device to scrape. The scraped up ice is then mechanically delivered to an internal container (which is why modern resurfacers look so big.) Some resurfacers can also vacuum up some the excess water that was sprayed earlier and recycle it.

Spray clean water a second time, often hot water, which will melt the top of the ice a bit and refreeze. Sometimes there is a wet towel like thing that is dragged over the warm water to make sure it is smooth.

Also, modern resurfacers usually have spinning brushes at their corners to pick up ice bits that gets stuck against the boards that surround the rink.

And after doing a run, the resurfacer is driven outside and the ice in the internal container is dumped on a pile where the sun should melt it (though during the winter the ice pile always seems to grow bigger and bigger. :) )