Biochar is a stable form of carbon produced via biomass pyrolysis for use in sustainable environmental and agricultural practices. The concept of biochar was initially triggered by the ancient practice in which humans deliberately mixed carbonized biomass into the soil to enrich the soil quality and fertility. According to the International Biochar Initiative (IBI), biochar can be defined as “a solid material obtained from the thermochemical conversion of biomass in an oxygen-limited environment.” Biomass-derived biochar production has been demonstrated as a potentially viable strategy for developing negative carbon emission technologies for climate change mitigation and as a material for the effective amendment of relatively poor agricultural soils. Most interestingly, ongoing biochar research has expanded broadly, stretching from its traditional core in environmental and agricultural science to studies in biochar for energy generation and as adsorbents for pollution treatment applications. The use of biochar for carbon sequestration and soil amendment has also attracted more interest from research scientists globally. Applying biochar as a material for soil amendment is closely linked with its potential for climate change mitigation by carbon sequestration. Specifically, the properties of biochar include resistance to microbial degradation and chemical transformations, high surface areas, high water retention capacity, cation-exchange capacity, porosity, and its effectiveness as support and substrate for soil microbes. These characteristics endow biochar with a more significant potential to become a beneficial material for improving agricultural productivity through soil quality enhancement while sequestering CO2 from the atmosphere to mitigate climate change. Activated carbon has traditionally been the primary choice for the adsorption of organic pollutants, yet recent research highlights the efficacy of biochar, derived from biomass, in pollutant removal. Notably, biochar demonstrates effectiveness against per- and polyfluoroalkyl substances (PFAS), a group of persistent environmental contaminants known as “forever chemicals.” Besides environmental remediation, biochar has enormous potential in healthcare applications such as wound healing, tissue regeneration, and drug delivery. In addition, due to biochar’s biocompatibility and low cytotoxicity, it can be effectively used for targeted therapeutic delivery. Biochar-based filtration systems can also ensure clean water for medical procedures and maintain air quality in healthcare facilities. In the food industry, biochar can be used to preserve and enhance product quality and safety. By using biochar in packaging, it is possible to extend the shelf life of food while also inhibiting microbial growth and reducing food waste.