In this booklet based mostly on Soviet and foreign periodicals the reader will find a story of radar. It tells, in a simple and informal manner, what radar is, what it does, and how, and why is it that radar has come to playa leading role in the present-day world. The booklet uses not a single mathematical formula; where necessary, pictures come to the readerâs help. The booklet has been written for a layman interested to know how and where radio and electronics serve man. From it, the reader will learn quite a number of facts, sometimes unexpected, about the capabilities of radar.