Green chemistry has emerged as a transformative scientific discipline aimed at redesigning chemical products and processes to minimize environmental impact, enhance resource efficiency, and ensure human safety. The framework of the Twelve Principles of Green Chemistry, introduced by Paul Anastas and John C. Warner, provides a systematic strategy for pollution prevention at the molecular level. This comprehensive review examines the theoretical foundations, historical evolution, and practical implementation of these principles across major industrial sectors, including pharmaceuticals, petrochemicals, polymers, agrochemicals, and renewable energy systems. Emphasis is placed on quantitative sustainability metrics such as atom economy, E-factor, process mass intensity, life cycle assessment, and carbon footprint analysis, which enable objective evaluation of green processes. The review further explores environmental applications encompassing waste minimization, wastewater treatment, air pollution control, biodegradable materials development, and climate change mitigation strategies. Catalysis, renewable feedstocks, green solvents, and biotechnological innovations are highlighted as central drivers of sustainable chemical transformation. Despite significant progress, challenges related to economic feasibility, technological scalability, and global standardization persist. Future advancements integrating artificial intelligence, advanced catalysis, and circular economy models are expected to accelerate the transition toward environmentally responsible chemical manufacturing. Green chemistry thus represents a scientifically robust and economically viable pathway toward sustainable industrial development and long-term ecological resilience. Keywords: Green chemistry; Twelve principles; Sustainable synthesis; Atom economy; Catalysis; Renewable feedstocks; Green solvents; Industrial sustainability; Environmental protection; Circular economy; Waste minimization; Life cycle assessment.