Hello, Jean Jose!
This is my second attempt at posting here! The first attempt took far too long to save and disappeared into the ether. As Jcarana said, it's all in the terminology, "Title" is the entire video clip(anywhere from a few minutes to two hours) while a "chapter" is a portion of that clip. The purpose of chapters is to divide a video into easily-found segments(portions) that can be found by going straight to them in the menu(selecting "Scenes") or using the "skip" button on the DVD player's remote control while the video is playing.
A hypothetical example here shows what I'm saying. A 50-minure video of a new baby coming into a family. Chapter 1 shows Mum and Dad with the new bub in her cradle, being carried through the maternity hospital reception area and out to the waiting family car(5 minutes for each chapter). Chapter 2, at home the new nursery(that was dad's office) is shown with cot, toys, pink wallpaper(they already knew it was gong to be a girl). Chapter 3, Baby Jenny being nursed by Mum, then Dad, 14-year-old brother Jim doing the camerawork, and on it goes until Chapter 10 where Auntie Nellie finally gets to have a nurse but Jenny's having none of this, lets out a hell of a scream, calming down only when Mum relieves Nellie of the burden. The chapter points are there to help quickly find that scene.(15 years later, Jenny's birthday party) Mum finds and loads that disc, it still plays well. Nellie is Jenny's favourite aunt, watches again how Jenny bawled her eyes out with that first nursing 15 years earlier. Hope that explains things.
Cheers!
Neil.