Chapter 1. Covered the solar radiation, Chapter 2. Studied the solar radiation intensity and air temperature, Chapter 3. Covered the basin solar still with magnetic treatment, Chapter 4. Described the drying camel sausages by solar dryer, Chapter5. Focused on the solar milk pasteurizer, Chapter 6 Covered the vacuum solar dryer, Chapter 7. Covered the solar essential oil extractor, Chapter 8. Described the natural convection indirect solar dryer for food, Chapter 9. Studied the experimental investigation of symmetrical double slope single basin solar stills productivity with different Insulation, Chapter 10. Focused on a new design of a single slop double- basin solar still, Chapter 11. Described the modification of a damaged tires to direct solar dryers and studying thier efficiency in food drying.