Here is a cute grammar joke that has been circulating the internet:
Personally, I prefer the Oxford Comma, but that’s a debate for another day. For now, I would like to discuss a certain grammatical relationship that’s common in the Bible. It is called the appositive. Consider this sentence:
My wife, Lena, is an awesome person!
In the above sentence, the word, “Lena,” is a repetition and clarification of the phrase, “my wife.” Who is my wife? Lena. Who is Lena? My wife. The word, “Lena,” is an appositive. It is in apposition with the phrase, “my wife.” Pretty easy, right?