Directive Principles
The provisions contained in this Part shall not be enforceable by any court, but the principles therein laid down are nevertheless fundamental in the governance of the country and it shall be the duty of the State to apply these principles in making laws.
This is the key difference between Directive Principles (this Part) and Fundamental Rights (Part III): you cannot go to court and sue the government for failing to achieve a Directive Principle - they are not directly enforceable. But they are meant to guide every law and policy decision the government makes, and courts frequently use them to interpret ambiguous laws in the way that best serves these goals.
You cannot file a case demanding the government immediately provide a "living wage" to all workers (Article 43) as a court-enforceable right - but when a court interprets an unclear labour law, it will often lean toward the reading that best advances that Directive Principle.