I believe they are two different people but my friends say the writer of 1st, 2nd, & 3rd John is the same as the writer of the book of Revelation.

Scholars agree that the writer of all four books is John.

If so, then why the description; John the Apostle as pertain to the writer of 1st,2nd & 3rd Jhon and John the Divine as pertain to the writer of Revelation ?

Those titles were added centuries later by church scribes and are not part of the inspired text, so they really don't mean anything. However, within the traditions the scribes were using, John son of Zebedee bore both titles.

Who wrote the book 0f john?

Who is the writer for gospel of john?

We don't know.

There are many web sites that discuss this. Here is one:

GOSPEL OF JOHN

All of your posts and questions have been merged. I am sorry you don't like the answers given but you need to keep it on one thread

Tradition is that John was the writer of all the books attributed to him. John has been given various titles in Scripture but they are all the same person