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Ups and downs (in the finance world, it's referring to the market).
Sometimes, volatility is called beta and is measured in numbers. If the market moves 2% and your stock moves 4% on average, it's beta is 2, roughly.
Why the diff? Well, Netflix has more ups and downs because investors are less sure about the company. The company doesn't pay a dividend and it has monster competitors. GM, on the other hand, is a slowly dying-ish company. It has relatively steady (albeit scant) earnings, and it pays a dividend, which keeps its stock price stable.
For a better encapsulation of volatility, we suggest Real Housewives.