The first microwave oven designed for household use was introduced to the market in 1955. It was called the "Radarange" and was produced by the Raytheon Corporation. The early microwave ovens were quite large and expensive, and they didn't become widespread in households until the late 1960s and early 1970s when smaller, more affordable models were developed and became popular appliances in kitchens around the world. Since then, microwave ovens have become an essential part of modern kitchen appliances, providing a quick and convenient way to heat and cook food.