Section 135 of the Companies Act, 2013 mandates certain companies to undertake Corporate Social Responsibility (CSR) activities. It applies to companies with a net worth of INR 500 crore or more, a turnover of INR 1000 crore or more, or a net profit of INR 5 crore or more during any financial year. Such companies are required to form a CSR committee to formulate and recommend a CSR policy, which should allocate at least 2% of the average net profits of the company made during the three immediately preceding financial years towards CSR activities. This section is significant as it legally binds companies to contribute to societal development, promoting ethical business practices. The statutory test involves meeting the financial thresholds, and the burden of proof lies with the company to demonstrate compliance through annual reporting. In practice, this section encourages companies to engage in sustainable development and social welfare activities.