The main roles of the executive branch in the U.S. government include implementing and enforcing laws, conducting foreign affairs, and managing national security. The President, who heads the executive branch, has the power to sign or veto legislation, appoint federal judges, and oversee various government agencies. Additionally, the executive branch plays a vital role in shaping public policy and responding to crises. Through executive orders and treaties, the President can promote their legislative agenda, thereby influencing the direction of the country’s governance and international relations.