Endophytic fungi, residing within plant tissues without causing harm, play a crucial role in enhancing phytoremediation—a sustainable method for removing pollutants from the environment. These fungi form symbiotic relationships with their host plants, promoting growth, stress tolerance, and the degradation of harmful substances. This study explores the multifaceted interactions between plants and endophytic fungi in the context of phytoremediation, particularly in heavy metal and organic pollutant environments. Key findings highlight the ability of endophytic fungi to enhance plant resilience, nutrient uptake, and pollutant degradation through enzymatic activity and metal sequestration. The fungi’s role in improving phytoremediation outcomes includes increased metal tolerance and absorption, facilitating the transformation of toxic substances into less harmful forms, and bolstering overall plant health. By leveraging these natural interactions, phytoremediation offers a promising approach to restoring contaminated ecosystems, reducing pollution, and supporting environmental sustainability.