The electromagnetic spectrum is essential to everyday life. Wireless devises let us make phone calls, turn on the television, pass through tollbooths without stopping, and use laptops without a cord. The electromagnetic spectrum provides radio waves for television and radio. It allows people to remotely control water, gas, and electricity systems. It facilitates medical monitoring, cargo tracking, air traffic control, and emergency services. In the military, the electromagnetic spectrum is needed for weapon guidance and radar. As we become more dependent on these devises, it becomes more difficult to prevent interference between systems.