Democracy means a system of Law and Government by the whole Population of the Selected Country which basically created by the Voting system.
All the people in a state or country votes for their best person they want to see as a Prime Minister or President. Then after voting is done there's must be an authority to calculate the votes and announce the name of the elected person.
Democracy is: "a system of parliament of a country to take care or every issue in the country"
In simple words, democracy means a government created by the people for themselves. Let's hope for more answers
And the leadership: The whole system of voting and elections for government in democracy is selecting the #1 leader in the country to hold the responsibilities.
If you can show that you are the best leader in a country the chances are people will elect you and give you the permission to create government in that country.
However, there are more ways to be a leader rather then standing in elections.