The primary role of the legislative branch in a democracy is to create, amend, and repeal laws. It serves as the representative body of the people, ensuring that various perspectives are considered in the law-making process. Additionally, the legislative branch holds the power to approve budgets and government spending, thereby influencing public policy. Furthermore, it can check the powers of the executive branch through oversight functions and approval of appointments, thereby functioning as a vital mechanism for maintaining a balance of power within the government.