Egg Incubators and Hatchers

What is the difference between egg incubator and egg hatcher?

Eggs are turned by the incubator every hour in the setter. After the setting period eggs are physically moved to the hatcher, where they will hatch on day 21/22. What is a hatcher? The hatcher is the part of the incubator where the eggs lay still for the last 3 days the incubation cycle