Every government has a head of State and a head of Government. For example, Elizabeth II is the head of State in the United Kingdom and Theresa May (PM Of UK) is the head of Government. In most countries, head of Government is the one who takes the first chair and makes the most important decision.
In India, Ram Nath Kovind is the head of State is the President and the head of Government is Narendra Modi.
The salaries of these heads depend from country to country. In some, Head of Government gets paid more in some head of state gets paid more.