Climate change presents substantial difficulties to global agriculture, affecting agricultural output and sustainability due to extreme weather events, soil degradation, and heightened disease prevalence. In this context, advantageous microorganisms, such as endophytic bacteria, fungi, and plant growth-promoting rhizobacteria (PGPR), have surfaced as a viable strategy to augment plant resistance against various challenges. These bacteria synergistically interact with plants, altering their physiological and biochemical pathways to enhance tolerance to abiotic challenges such as drought, salt, and temperature variations, as well as biotic pressures like diseases and pests. Microbial inoculants can affect stress-responsive gene expression, augment antioxidant enzyme activity, and promote nutrient absorption, thus enhancing overall plant health and production. This study examines recent progress in comprehending microbial–plant interactions, emphasizing the processes by which these advantageous microorganisms alleviate stress-induced damage. Additionally, it examines novel strategies, like bioformulations and microbial consortia, that might transform sustainable agriculture in response to climate change. Integrating beneficial microorganisms into crop management strategies might enhance agroecosystem resilience and assure food security under climate change.