Nowadays, almost everyone knows everything that happens in the battle between aircraft, tanks, fighters and submarines. Everyone saw this technique and are familiar with its action either directly, or from films and television programs. However, the mention of EW usually causes a rather vague understanding of this type of struggle, which is conducted on the air and concerns radio and radar radiation. What is EW really? What is this mysterious activity, about which so much is said and which goes on without stopping even in the calmest moments of peacetime?