e.g. Your friend Ahmed Al-Ali is here.
In the previous example, “Ahmed Al-Ali” is an appositive. It is in apposition to the noun phrase “your friend”. Both NPs “your friend” and “Ahmed Al-Ali” describe the same person.
فيه فرق بين الكلمتين خلو بالكم ولا تلخبطون فيها appositive و apposition