A democratic country needs a constitution because the constitution provides the basic law of how the country is to be government. The constitution establishes essential features of the way a democratic country is to be governed. These features include
1. The duration that a government can function before new elections need to be called.
2. The separation of power between the legislature, executive and judiciary.
3. The manner in which a democratically elected government can be removed.
4. The fundamental rights of citizens.
5. The respective powers of the legislature, executive and judiciary.