EMC Electromagnetic Compatibility (EMC) is the ability to ensure that electronic devices function properly in an electromagnetic environment and do not interfere with each other. Let me explain briefly:
Electromagnetic Interference (EMI): Electronic devices emit electromagnetic energy, known as radiation. If this radiation interferes with the proper functioning of other devices, it is called electromagnetic interference (EMI).
Electromagnetic Compatibility (EMC): Ensures that the device is neither affected by external electromagnetic interference nor can it interfere with other equipment. This includes two aspects: immunity (the device is not interfered with) and radiation control (the device does not produce too much interference). 
Tests and standards: To ensure that the equipment meets EMC requirements, tests are required to check the electromagnetic performance of the equipment at different frequencies. There are a series of EMC standards internationally, such as the CE mark in the European Union and the FCC standard in the United States.
Influencing factors: Electromagnetic compatibility is affected by factors such as electromagnetic fields, sources of electromagnetic interference, the device's own circuitry, and electromagnetic radiation.
Applications: EMC is critical in electronics, communications, automotive, aerospace, and more. Good EMC design ensures that the device operates stably in a variety of environments while maintaining interoperability with other devices.
EMC's philosophy is to ensure that equipment "coexists" in an electromagnetic environment, avoiding interference and keeping the equipment working properly.
Of course, let's move on to the concept of electromagnetic compatibility (EMC) and why it's important.
Overview of Electromagnetic Compatibility (continued).
The core goal of electromagnetic compatibility is to ensure that all electrical and electronic equipment or systems can function properly in a coexisting electromagnetic environment without degradation, malfunction, or complete failure due to electromagnetic interference (EMI) generated by each other. In other words, a product with good electromagnetic compatibility should: Emission limit compliance: The equipment should ensure that its own electromagnetic disturbance (EMI) does not exceed the specified limits during normal operation to avoid harmful effects on other equipment or systems.
Immunity requirements: The equipment needs to be sufficiently immune to maintain the expected level of performance without unacceptable degradation or interruption, even when subjected to electromagnetic disturbances in the surrounding environment.
Major EMC components
Electromagnetic Disturbance Suppression (EMI Reduction): Reduce the electromagnetic disturbance emitted by the equipment through reasonable circuit design, grounding technology, shielding technology, filtering technology and wiring strategy.
Electromagnetic susceptibility (EMS) enhancement: Improve the resistance of equipment to electromagnetic disturbance, usually through circuit protection, filter protection, isolation design, and software anti-interference measures.
Electromagnetic compatibility design and testing: Integrate EMC considerations into the product design stage, carry out EMC** and estimates, and then verify the EMC performance of the product through laboratory tests, including conducted disturbance test, radiated disturbance test, surge test, electrostatic discharge test, pulse group test and other test items.
Regulatory compliance: All countries and regions have standards and regulations on electromagnetic compatibility, such as EN 55000 series standards under the EU CE mark, FCC Part 15 standards in the United States, GB T 4365 series standards in China, etc., and the products must meet the EMC requirements for corresponding market access.
Application & Significance
Electromagnetic compatibility technology is widely used in aerospace, automotive electronics, industrial control, communication equipment, consumer electronics and many other fields, which is related to the safety, reliability and overall performance of modern electronic products and systems. With the rapid development of technologies such as the Internet of Things, 5G communication, and autonomous driving, the importance of electromagnetic compatibility has become increasingly prominent, and it has become a key link in technology research and development and product quality control around the world.