Definition: This is something that a citizen should do but is not required to do so by law. It is an obligation that a citizen fulfills voluntarily.

Example: Examples include being informed, voting, and volunteering

The fundamental duties of a citizen are not enforceable but are part of the constitution.

Explanation:

The fundamental duties of  citizen are their duties to the country of their residence as the citizens of that country.

These are directive principles and not enforced ones but a good citizen follows them and works on them to uphold the values of their government and the constitution of their country.

These include being an informed citizen, knowing one's voting rights and voting every time they are required to, volunteering for community service and much more.

b) to encourage free trade