The primary energy source for solar panels is sunlight. Solar panels are designed to capture solar energy and convert it into usable electricity through a process called photovoltaics. When sunlight hits the solar cells in panels, it excites electrons, creating an electric current. This process is clean and renewable, making it an increasingly popular solution for energy production in homes and businesses. As technology advances, solar panels are becoming more efficient in converting sunlight into electricity, contributing to a reduction in reliance on fossil fuels and helping combat climate change by providing a sustainable energy source.