Electromagnetic fields (EMF): Invisible areas of energy, often referred to as radiation, are associated with the use of electrical power and various forms of natural and man-made lighting. In the context of security, EMFs can be a concern as they may be used in side-channel attacks where an adversary could potentially capture information from the radiation emitted by a device. Measures such as shielding and maintaining a secure physical distance can be used to mitigate this risk.