This document summarizes a presentation about Ruby on Rails given at BarCamp Saigon in December 2010. It introduces Ruby on Rails as a full-stack web framework built on Ruby that follows conventions over configurations and Don't Repeat Yourself (DRY) principles. It discusses starting a new Rails application, using the model, view, controller (MVC) pattern with Active Record to manage data and perform CRUD operations. It also covers routing, controllers, views, mailers and other Rails features.