In computer science, an object is a region of memory that contains a value and is referenced by an identifier). In the object-oriented programming paradigm, an object is an abstract data type that combines variables, functions, and data structures). Objects are the structural building blocks of a system, forming a cohesive unit of state (data) and services (behavior). Every object has a specification that defines its properties and behavior.

In C, objects can be considered as regions of data storage where values can be stored. The language uses the term "object" to refer to a named region of memory that can hold a value of a particular type. For example, a variable declared in C is an object that can store a value of a specific type. C also has its own quasi-objects such as structs that can be considered as objects.

In C++, a class is a user-defined data type that has data members and member functions. An object is an instance of a class, which holds its own data members and member functions. A C++ class is like a blueprint for an object, defining its properties and behavior.

In summary, an object in C is a named region of memory that can hold a value of a particular type. In C++, an object is an instance of a class that holds its own data members and member functions.