Question about government spending from an amateur

I am an MBA with no knowledge of macro economics. In fact I know nothing about economics <br><br>So here is my question<br><br>I cant understand how governments in the United States decided to spend 2 trillion dollars in the next 3 years. What is the money they are going to spend. Did they print it? What happens to inflation. I keep hearing that low interest rates are keeping inflation down. <br><br>I am completely confused about how they have so much money for programs