Have you ever played a game with your friends where one friend makes all the rules and decisions without giving anyone else a say? That's kind of like what an elective dictatorship is when it comes to politics.
In a regular democracy, everyone gets to vote for their leaders, and those leaders have to follow rules and get approval from groups like a parliament or congress before doing anything significant. But in an elective dictatorship, the leader (usually the president or prime minister) has so much power that they can make decisions without much oversight or approval from anyone else.
It's called an "elective" dictatorship because the leader was still elected by the people, but once they're in power, they don't have to listen to anyone else. This can be dangerous because one person making all the decisions can lead to bad policies, unfair treatment, or even abuse of power.
Some people argue that elective dictatorships can be justified in times of emergency or crisis, but generally, it is better for a democracy to have checks and balances to prevent one person from having too much power, and to make sure everyone's voice is heard.