What is VA (Vertical Alignment) Technology?

- I've linked a few VA monitors below in various price categories, form-factors, and refresh rates:
Viotek GN34C: http://amzn.to/2xP4FwX
BenQ GW2760HL: http://amzn.to/2xOKcbF
AOC C4008VU8: http://amzn.to/2xP7Y7r
Acer Predator Z35P: http://amzn.to/2x5f6xM

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