Step 1: Define each government type briefly.
Democracy = government by the people through free elections; Republic = elected representatives govern with no hereditary monarch; Federalism = power divided between a central government and regional units.
Step 2: Match the question to the correct type.
The question asks for a government run by a SINGLE person holding ABSOLUTE power - no elections, no checks and balances, and no shared authority.
Step 3: Identify Dictatorship.
A Dictatorship is a system in which one ruler exercises total, absolute, and often forcibly maintained power over the state with no democratic accountability.
\[ \boxed{\text{Dictatorship}} \]