EMC is the capability of electrical and electronic systems, equipment, and devices to operate in their intended electromagnetic environment within a defined margin of safety and at design levels of performance.
EMI is defined as any conducted radiated or magnetically induced voltage which degrades, obstructs, or repeatedly interrupts the desired performance of electronic equipment.
The International Electrotechnical Commission (IEC) is an international standards organization dealing with electrical, electronic and related technologies.
In order to permanently enjoy today's commodity electricity on a high quality level, manufacturers need to ensure more than the electromagnetic compatibility of their equipment alone.