Citizens' duties are the mandatory actions that individuals are legally obligated to perform as members of a society, whereas responsibilities are the voluntary actions that individuals should consider important for the betterment of their community and society as a whole.
An example of a duty is paying taxes, which is a legal requirement that helps fund government services and infrastructure. A responsibility, on the other hand, could be participating in community service, which is a voluntary act that contributes to social welfare and strengthens community ties.