Social movements are significant in changing legislation as they push for reforms and influence public policy through organized collective action. These movements mobilize individuals around specific issues, such as civil rights, environmental protection, or social justice, raising awareness and generating public support. By applying pressure on lawmakers and governing bodies, social movements can drive legislative change, challenging the status quo. Historical examples demonstrate how social movements have successfully reshaped laws and public policies, highlighting their role as catalysts for social progress and democratic development.