User: Who is the 46th president of the United States?
Assistant: The president of the United States (POTUS) is the head of state and head of government of the United States of America and the commander-in-chief of the United States Armed Forces. The president is also the head of the executive branch of the federal government of the United States and is the chairman of the presidential cabinet.

Joe Biden is the 46th and current president of the United States, in office since January 2021.