What is a difference between the president’s formal and informal powers?

Formal powers are listed in the Constitution, while informal powers are not.
Formal powers are created in the executive branch, while informal powers are not.
Formal powers are created by Congress, while informal powers are not.
Formal powers are changed over time, while informal powers cannot be changed.

Formal powers are listed in the Constitution, while informal powers are not.

Explanation:

One example of president's formal power is the power to be Commander in chief of the military. This power is directly written under the Article II Section 2 of the U.S. Constitution,

One example of the president's informal power is conducting foreign policy initiatives. Even though this power is not directly written in the constitution, leaders of the foreign country know that they have to talk to the president if they want to strike a  deal with united states.

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acts of terrorism occur globally. the united nations global counter-terrorism strategy was created in order to build adequate systems of support and solidarity with victims of terrorism. here´s a summary of the proposed key themes: the importance of giving victims a face and a voice; protecting their dignity; giving victims legal status and defending their legal rights; providing victims with medical, psycho-social and financial support; building solidarity with victims; improving media coverage of victims; and focusing on the link between victims and counter-terrorism efforts more generally.