Object

An object is just a placeholder for the identification of a system, where a system can be composed of many objects, or just a unique object without additional references. In Category Theory, The notion of an object is the most fundamental kind of mathematical data type. It is often distinguished by a label, or a name, assigned by a programmer or a mathematician, to help define the identities of the objects. Objects by themselves can hold a lot of internal information, or it can be just a placeholder designated to help formulate a problem. It is the most generic kind of data representation, so that it is often considred to be the first-class citizen of data representation, especially in the realm of Object-based or Object-Oriented Programming.