The president holds both expressed powers, granted explicitly by the Constitution, and implied powers, which are not expressly stated but have been accepted as necessary to successfully defend the Constitution.
Executive Powers (Article II, Section 2 & 3)
Execute Law through organized Federal bureaucracy
15 executive departments organized by the executive (the Cabinet) carries out administration. Ultimately, it is the President's responsibility to execute and enforce laws created by Congress.
This power has been used to legislate anything from nominations to war declarations to emergency management. Not only can the president adjourn Congress in states of emergency, but this power may also be utilized to bring members to the table when chambers disagree on when to adjourn.
Diplomatic and Military Powers (Article II, Section 2)
Receive ambassadors and other public ministers
This power allows the President adequate means to resemble the mouthpiece in which the US speaks to other nations. With this, the President can adequately advocate and communicate the needs of the nation.
Draft and enter into treaties with Senate Ratification
This power requires approval by the Senate, indicating this power demands bipartisanship. This allows for the senate to both advise the President on matters of national interest as well as to check the President's power.
The Constitution declares the President as Commander in Chief, but the verbiage is neither clear nor precise in defining the extent of the power. However, discussions between Congress and the Executive and various legislations have allowed for better navigation.