Maintaining the clean environment and reducing the usage of fossil fuels requires switching to renewable sources of energy, because of limited resources of fossil fuels and having insufficient fossil fuel storage. The world is facing from shortage of fossil fuel and its cost is going too high and its smoke is very harmful to the environment. In this crisis, the world is starting the use of renewable energy. Renewable energies are easily available, and it reduces air pollution and fuel cost. non-conventional energy sources, like solar energy, atomic energy, hydroelectric power, wind energy etc. are a substitute for conventional energy. Solar energy is the best one, is used in various utilization, like solar air heaters, solar water heaters, solar power generation, solar pumps, solar cooking etc. Solar air heater that absorbs heat from the sun's radiations to heat air and it is collected by the collector & converted into kinetic energy and also restored in the form of potential energy. In this review, we will discuss the role of ribs in solar air heating systems to enhance the heat transfer rate, types of rib, and the purpose of ribs arrangement in solar air heating systems. Ribs are used to transfer maximum heat and increase the pressure inside of the cabin and it located on the absorber plate surface and it help to increase the solar air heaters performance. This study emphasizes exploring the effects of ribs and the behaviour of fluid after impacting on the ribs. For drying crops, heating buildings, and other uses, solar air heaters are extremely important in the agriculture sector, small-scale industries, in urban and villages for heating and drying purposes, etc. The use of ribs can enhance the effectiveness of a solar air heating system and this technology can be used for heat transmission enhancement, power generation & can fulfil the world's energy requirements. The primary objectives of this review article are to assist and summaries the research work carried...