A chassis is the main frame or structure of a vehicle or machine, to which other parts are attached. In cars, it includes the base frame that supports the body, wheels, and engine.
“Chassis” comes from French “châssis,” meaning “frame” or “window frame.” It originally referred to frames that held things together and then expanded to mean the structural base of machines.
The chassis is like the skeleton of a car—everything else is basically clothing and organs. Tech people also talk about a computer chassis, treating the case like a machine’s “body frame.” Once you notice the frame idea, you’ll see “chassis” hiding in lots of engineering conversations.
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