In some democratic nations, citizens use a system of elections where if no one candidate gets more than 50 percent of the votes, everyone is eliminated except for the top two contenders. Citizens then vote again and may select either of the top two candidates. This is an example of a election system.

majority with run-off      

Explanation:

In some democratic nations, citizens use a system of elections where if no one candidate gets more than 50 percent of the votes, everyone is eliminated except for the top two contenders. Citizens then vote again and may select either of the top two candidates. This is an example of a majority with run-off election system.  In majority runoff election system, a candidate wins outright in the first round if she/he obtains  an absolute majority of the votes or else the two top contenders will be subjected to a second round of voting to decide a winner.