Corporate social responsibility has evolved over time from religious and philosophical roots to its current form. During the 1950s-1990s, CSR developed as a concept through the work of thought leaders and in response to social issues. In the 1990s-2000s, tools and frameworks like the triple bottom line and UN Global Compact helped build momentum and mainstream CSR. Today, CSR is integrated into business strategy and viewed as contributing to competitive advantage and social license to operate. Mandatory CSR spending laws in countries like India have further advanced the evolution of CSR into practice.