This deck provides an overview of key concepts in Objective-C including MVC architecture, classes, instances, methods, properties, delegates and protocols, Xcode IDE, and common classes and terms. It explains that MVC separates applications into modular and replaceable models, views, and controllers. Classes define properties and methods while instances contain property values. Methods are messages sent to objects. Properties use accessor methods. Header files define public interfaces while implementation files contain private code. Delegates and protocols allow communication between decoupled components.