Answer:
Provide advice to the president to aid in decision making
Step-by-step explanation:
The president’s Cabinet is made up of the Vice President and the heads of the 15 federal executive departments and they are regarded as the president's most trusted advisors. Its function is outlined in Article II, Section 2, of the U.S. Constitution:
"The President (...) when called into the actual service of the United States; he may require the opinion, in writing, of the principal officer in each of the executive departments, upon any subject relating to the duties of their respective offices..."
Therefore, the Cabinet's main function is to provide advice to the president on any matter related to their executive departments in order to aid him or her in decision making.