Here's a breakdown:
* Branches: The three main branches of the US government are the Legislative Branch (Congress), the Executive Branch (President and Cabinet), and the Judicial Branch (Supreme Court and lower courts).
* Departments: The Executive Branch is divided into 15 departments, each headed by a Secretary (except for the Department of Justice, headed by the Attorney General). Examples include the Department of Defense, Department of Education, and Department of Health and Human Services.
* Agencies: Departments are further subdivided into agencies, which carry out specific tasks within the department's purview. Examples include the Environmental Protection Agency (EPA) within the Department of Health and Human Services and the Federal Bureau of Investigation (FBI) within the Department of Justice.
* Bureaus: Agencies can also be subdivided into bureaus, which focus on even more specific tasks. Examples include the Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF) within the Department of Justice and the Bureau of Labor Statistics (BLS) within the Department of Labor.
* Commissions: The government also creates commissions to address specific issues or study particular topics. Examples include the Federal Trade Commission (FTC) and the Securities and Exchange Commission (SEC).
* Offices: Finally, offices are often created within departments, agencies, or bureaus to handle particular functions. Examples include the Office of Management and Budget (OMB) within the Executive Office of the President and the Office of Personnel Management (OPM) within the Department of Homeland Security.
This is just a simplified overview, and there are many variations and exceptions to these terms. For instance, some agencies are independent of departments and report directly to the President. However, this breakdown provides a general understanding of how the US government is organized.