A relative pronoun is a pronoun that introduces a relative clause. It is called a "relative" pronoun because it "relates" to the word that it modifies.

هي ضمائر التي تسبق الجزء التاني من الجملة وتشير الي ضمير محدد لعدم التكرار

Who/which/that

He is the doctor. He saves my life.
He is the doctor who saves my life.
She is an actress. She won two Oscars.
She is an actress that won two Oscars.
This is the dog. The dog that bites me.
This is the dog which bites me.

Becca and Kai played together all day. The two friends played outside in the morning. They rode bikes and scooters. They ate lunch on the porch. Becca’s mom made sandwiches and lemonade. They played hide-and-seek in the house right after lunch. Then they did not know what to do. “I know! Let’s play the number game,” said Becca. “What number am I thinking of?” “Is it five?” asked Kai. “No, it is higher than five,” Becca said. “Okay, is it one hundred?” “No, it is lower than one hundred,” Becca said. “Let’s see,” said Kai. “Is it sixty?” Becca gave Kai a hint. “It is between twenty and thirty.” “Hmm, is it twenty-five?” “No, but you are very close!” Becca said. “Well, is it higher or lower than twenty-five?” “It is lower,” Becca said. “Okay, I think I know. Is it twenty-two?” “Yeah! You guessed it.” Becca said. “Good job!”