What is EMC?

EMC refers to the electronic products in the electromagnetic field in terms of the size of the interference (EMI) and anti-interference ability (EMS) of the comprehensive evaluation, is one of the most important indicators of product quality, electromagnetic compatibility measurements by the test site and test instruments. (Baidu's)

In layman's terms, EMC is to simulate your actual situation, your product will be harmed, or your product will be harmed by other products or people, such as static electricity test, is a simulation of the actual human body to take the key to the product discharge; surge is a simulation of a lightning strike, etc., any of the test of the EMC is of practical significance.

I hope my answer helps you!