Democratic government has some features which are not valid in the other form of goverment, monarchy.
Some of those features :
1. citizens have a role in the government, they elect the representatives .
2. Freedom is respected in democracy.
3. There is secularism, all religions are equal.
4. Leaders are elected suitably, its not like a monarchy in which crown is passed from a generation to the next.
5. Discrimination is strictly prohibited. Sometimes , in a monarchy it is not. :)