This document summarizes solar energy, including its sources, advantages, and disadvantages. Solar energy is radiant light and heat from the sun that can be harnessed using technologies like solar heating and photovoltaics. There are two main types of solar energy systems: active systems that use solar energy to heat a fluid and rely on backups, and passive systems that operate without external sources by collecting solar energy through south-facing windows. Major uses of solar energy include daylight, drying agriculture products, space heating, water heating, and generating electricity through concentrated solar power and photovoltaics. While solar energy is clean, sustainable and free, its equipment can be inefficient and costly, it is only part-time, and reliability depends