You must have heard about news feed several times on Facebook but it might be confusing to you. What is a news feed on Facebook? It is the constantly updating list of stories in the middle of your home page. Your home page is the first thing you see when you log in to your Facebook account.
Read: Where can I find my timeline on Facebook
To answer your question, It is the first thing you when you log in that shows your friend’s posts, updates from pages you like and the groups you joined.