Final answer:
It is the President's duty to keep Congress informed of the state of the union through an annual address, which outlines policy agendas and updates on the nation's status. This address occurs every January before a joint session of Congress and is part of the President's constitutional responsibilities.
Step-by-step explanation:
The duty to keep Congress informed of the state of the union is assigned to the President of the United States. This responsibility is outlined in Section 3 Clause 1 of the U.S. Constitution.
It mandates that the President must from time to time give to the Congress Information of the State of the Union, and recommend to their consideration such measures as he shall judge necessary and expedient.
The State of the Union Address serves as a communication platform for the President to present his policy agenda and provide status updates on the nation's well-being to a joint session of Congress.
This address, which takes place every January, is not only a constitutional duty but has evolved into a significant aspect of the President's "bully pulpit" power. Although the content of the address is not binding on Congress, it is an important part of presidential legislative agendas.