Smalltalk

…original object-oriented language was called Smalltalk, in which all programs were represented as collections of objects communicating with each other via message-passing. An object is a set of data together with the methods (functions) that can transform that data. Encapsulation refers to the fact that an object’s data can be…

…programming language for it called Smalltalk. Although the technology was not yet available to produce his “Dynabook,” Smalltalk was instrumental in creating the graphical user interface for the Alto. Smalltalk was the first true object-oriented computer programming language, and it remains popular with PC programmers.

…to object-oriented programming languages, including Smalltalk, and to personal computing.