# Loops, CDUs and cooling methods

Lesson 2 of [Liquid cooling foundations for buyers](https://liquidcooling.fyi/academy/liquid-cooling-foundations.md), 14 minutes.

Liquid cooling is a chain of loops. Each loop has its own job. Two loops and one unit between them - Technology cooling system (TCS): the IT loop. It runs from the coolant distribution unit (CDU) to the cold plates. It carries heat away from the IT equipment. - Facility water system (FWS): the loop…

The rest of this lesson is for learners enrolled in the course. [See how Liquid cooling foundations for buyers works](https://liquidcooling.fyi/academy/liquid-cooling-foundations.md).

Also on the [web page](https://liquidcooling.fyi/academy/liquid-cooling-foundations/loops-cdus-and-cooling-methods).