Simple Definition:

Democracy is a form of government where the people have the power to vote and make decisions.

For example, in a democratic country, the citizens can vote for their leaders, such as the president or prime minister. They can also sometimes vote for laws and policies in a referendum [public vote on a specific matter].

Very Simple Definition:

Democracy is when people have the power to choose their leaders and make decisions together.

For example, in a democracy, people can vote for who they want to be the leader of their country. They can also vote on rules and laws that are very important.