All of our electronic devices create electromagnetic fields. It is important though that an electronic device be properly shielded, not just from emitting its field to other electronics around it, but also to prevent other electronics EM fields from messing with their capabilities. As a result, anyone wishing to develop and release any form of electronic device is required to go through the steps of testing its shielding and ground capabilities. This is known as an EMC or Electromagnetic Compatibility test and it is done in specially designed testing facilities.
In most cases, the EMC test facility is composed of an anechoic chamber. This chamber is exactly as it sounds; a chamber in which no echo is produced. Both sounds and frequencies will bounce off of various surfaces at different rates. The anechoic chamber prevents any other frequencies or fields from entering the facility so that the testing equipment is testing the electronic device without any contamination from other nearby fields. They will test the device for both its susceptibility to other fields as well as its emissions before giving it a proper approval.
Without a proper approval from an EMC test facility, an electronic device will not be allowed to be sold in many countries in the world. Imagine if your hard drive was not properly shielded and was receiving signals from your power supply or even the CR ROM. This would not be a good thing for your computer. Now just imagine an entire office filled with computers; without proper insulation, we would not have the internet as we know it today.
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