About Presidential System
A presidential system is a democratic and republican system of government where a head of government leads an executive branch that is separate from the legislative branch. This head of government is in most cases also the head of state, which is called president.
Terry Gou: The Taiwan iPhone billionaire who wants to be president

... In a winner-takes-all Presidential System, when there are already two opposition candidates vying to unseat the incumbent party, adding a third probably isn t going to make the task easier...
Turkey elections: Erdogan and Kilicdaroglu offer stark choices for presidency

... But the man seeking to replace him wants to scrap the Presidential System and become an " impartial" leader, with no connection to a political party...
Kemal Kilicdaroglu: Opposition picks 'Turkey's Gandhi' to challenge Erdogan in election

... " He also said he would return the country to a parliamentary system - Mr Erdogan oversaw a transition to a Presidential System in 2018, gaining sweeping powers...