In Electronics. What's the difference between Hysteresis and Threshold?

Question

In Electronics. What's the difference between Hysteresis and Threshold?

Answer 1

The threshold is the input level at which the system changes state.  Hysteresis implies two slightly different threshold values, such that a change from 'state A' to 'state B' occurs at a different input level than a change from 'state B' back to 'state A'

Answer 2

In electronics, we define these two terms in the following fashions :

Hysteresis is to have a higher reference level when the input voltage goes from a lower to higher value than when it goes from a higher to lower value. e.g a common household thermostat that turns the furnace on at one temperature and off and another.

Threshold is the characteristic of a circuit in which two different trigger levels create an offset or lag in the switching action e.g. a 555 timer.

Both of these have similar applications in Electronics. I hope you have your answer.