> For the complete documentation index, see [llms.txt](https://certil-remy.gitbook.io/learn/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://certil-remy.gitbook.io/learn/oop-ruby/untitled.md). # OO Ruby Video: Object Orientation Overview ## Objectives * Explain how objects are metaphors for real life concepts * Define a new class with the `class` keyword * Instantiate instances of the class with the class constructor `new`. * Add attributes to our instances with setter/getter methods and instance variables * Use the attr\_accessor, attr\_reader and attr\_writer methods to dynamically create setter and getter methods * Keep track of all our class' instances with class variables and class methods * Hook into an object's instantiation with #initialize * Explain when to use implicit versus explicit receivers * Define a class find\_by\_name method to find specific instances \ View [OO Ruby Video: Object Orientation Overview](https://learn.co/lessons/oo-ruby-video-object-orientation-overview) on Learn.co and start learning to code for free.