Legislature: This is a deliberative assembly with authority to make laws for a political entity such as a country or city. They're like head referees who decide what rules will govern play.
Executive Branch: The executive branch carries out and enforces laws. It includes people at highest levels of government who have executive power - they're like field referees enforcing rules during play.
Judiciary Branch: The judiciary interprets laws and administers justice according to those interpretations - they're like video assistant referees reviewing plays and making final decisions.