Drought, which is one of the most important abiotic stress factors that adversely affect yield and quality in crop production, is defined as a meteorological concept that lasts long enough to endanger the life of the plant with the limited amount of water contained in the soil and is lower than the average rainfall. Drought seriously affects crop production depending on the water holding capacity of the soil, morphological (age, root structure, etc.) and physiological (evapo-transpiration rate, transpiration coefficient) structure of plants. Drought, especially under arid and semi-arid conditions, can affect plant growth and even survival. With drought stress, leaf area in the plant decreases and photosynthesis slows down and decreases accordingly. While stomatal size decreases in drought stress, stomatal number is positively correlated with stomatal permeability, CO2 assimilation and water use efficiency. Plants react to drought stress depending on their genetic structure and climatic factors in order to survive. These responses can be listed as escape from drought stress, prevention of water loss and tolerance to water loss.