Radeef are the repeated words that come at the end of a poem
Kaafiya are the rhyming words that comes before Radeef
eg:
Chupke chupke raat din aanshu bahana Yaad hai
humko to ab tak aashiqui ka woh zamana yaad hai
here the radeef is "Yaad hai" and the kafiyaa is "bahana and zamana"