Sustainability is the principle of meeting present needs without compromising the ability of future generations to meet theirs, balancing environmental, social, and economic priorities.
ESG (Environmental, Social, and Governance) is the framework that measures and discloses how companies manage risks and opportunities in these areas.
The two concepts overlap but are not interchangeable: sustainability is the vision, while ESG provides the structure, metrics, and accountability to turn that vision into measurable business outcomes.