Solar panels, also known as photovoltaic (PV) panels, have been in use since the mid-20th century. Initially, they were limited to space applications, providing power to satellites and other space vehicles. However, advancements in technology have made solar panels more efficient, affordable, and accessible to the average consumer. Today, they can be found on rooftops, in solar farms, and integrated into various building designs, providing a clean and renewable source of energy.