How The Lm339 Works Lm339 Comparator. New To This Ic. How Does It Work Exactly.... Does It Also Amplifiy The Output?

Lm339 comparator. new to this ic. how does it work exactly.... does it also amplifiy the output? - how the lm339 works

1.If LM339 used as a comparator compares the voltage discharge of a capacitor with a reference voltage?
2.How can be downloaded via the input pin can be avoided?
3.again, they saturated the ups and downs?
4. What is a comparator hysteresis .. LM339's very low, which means? Difference between high performance and low power? if this difference is very small then, as clearly the difference between high and low?