A more thorough explanation:

An executive agreement is a type of international agreement that is made by the President of the United States without the need for approval by the Senate. These agreements usually involve routine diplomatic or military matters and are different from treaties, which require Senate approval.

• President Obama's executive agreement with Iran regarding their nuclear program
• President Trump's executive agreement with North Korea regarding denuclearization

These examples illustrate how executive agreements are used by the President to address important international issues without the need for lengthy negotiations and Senate approval. In both cases, the President was able to make agreements with other countries quickly and efficiently, allowing for progress to be made on important issues.