This lecture introduces the concepts of classes, objects, attributes, and methods in C++. It covers the definition of classes and instances, declaration of attributes and methods, access to attributes, and the scope of attributes. The lecture also explains how to declare and define methods, the difference between actions and predicates, and how to call methods for instances. Examples are provided to illustrate these concepts, along with a summary highlighting the importance of encapsulation and abstraction in object-oriented programming.