Around the world, drought stress is a major abiotic element that is drastically lowering crop yield. The intensity of drought has grown due to the rapid evolution of climate change, which poses a serious danger to the world’s food security. To ensure sustained agricultural production, this issue must be resolved. In order to improve agricultural performance under stress, a variety of tactics are being used. One popular method for enhancing soil health and increasing crop yields under stress is biochar. The application of biochar improves soil organic matter, boosts nutrient and water retention, and strengthens aggregate stability and soil structure. The activity of helpful fungi and bacteria is also encouraged, which together increase the plant’s resistance to abiotic stressors. Biochar greatly increases tolerance to stress by improving membrane stability, water absorption, nutritional balance, and antioxidant activity, which lowers the generation of reactive oxygen species (ROS). Furthermore, the addition of biochar to soil improves gene expression, photosynthesis, chlorophyll synthesis, and the activity of stress-responsive proteins. Additionally, it supports tolerance to osmotic and ionic stressors by regulating osmolytes and preserving hormonal homeostasis. To sum up, biochar exhibits a lot of promise as a soil supplement that can improve plants’ resistance to drought stress. We have looked at a number of ways that biochar helps to increase drought resilience in this chapter. These include improving water retention, stabilizing cell membranes, encouraging homeostasis and nutrient uptake, increasing antioxidant activity to lessen oxidative damage, and facilitating improved photosynthetic efficiency. Furthermore, biochar controls osmolytes, affects gene expression, and preserves hormonal equilibrium—all of which are essential for enhancing a plant’s resistance to drought. Biochar is a useful tool for encouraging sustainable farming practices in areas that are prone to drought because of its many advantages.