Question

what do you mean by khalifa

Answer 1

Khalifa which means successor.

Answer 2

Khalifa or Khalifah is a name or title which means "successor", "deputy" or "steward". It most commonly refers to the leader of aCaliphate, but is also used as a title among various Islamic religious groups and orders. Khalifa is sometimes also pronounced as "kalifa". There were 4 khalifas after Mohammed died, beginning with Abu Bakr. This was a difficult decision for the people to make, for no one except Mohammed had ever thought with foresight about who would rule after he would die. 
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