The president signs bills to become laws. First, Congress writes a bill and votes on it. If Congress passes the bill, it goes to the president. When the president signs it, the bill becomes a law. The president signs bills to become laws.
From the archives
President Donald Trump and First Lady Melania Trump arrive to the White House Rose Garden for a bill signing ceremony for the Take it Down Act (54539953784)The White House, via Wikimedia Commons · Public domain