The concept of the 'stored-program computer,' a foundational element of modern computing, is primarily attributed to John von Neumann. His 1945 paper, 'First Draft of a Report on the EDVAC,' meticulously outlined this architecture. In this design, both program instructions and the data they operate on are stored in the same main memory, allowing for much greater flexibility and programmability than earlier machines which often required physical re-wiring to change programs. While Alan Turing made significant theoretical contributions to computability, Grace Hopper pioneered compiler development, and Claude Shannon established information theory, it was von Neumann who articulated this specific architectural paradigm.

The UNIVAC I (Universal Automatic Computer I) holds the distinction of being the first general-purpose electronic digital computer made available for commercial use. It was developed by J. Presper Eckert and John Mauchly, who also created ENIAC. The first UNIVAC I was delivered to the U.S. Census Bureau in 1951, primarily for processing demographic data, thus marking a significant milestone in bringing computer technology to business and government sectors beyond purely scientific or military applications. ENIAC (Electronic Numerical Integrator and Computer) was an early electronic general-purpose digital computer, completed in 1945, but it was not commercially produced; it was built for the U.S. Army. EDSAC (Electronic Delay Storage Automatic Calculator) was an early British computer, notable for being the first stored-program electronic computer. It ran its first program in 1949 but was not a commercial product. Colossus was a series of secret British computers used for code-breaking during World War II, predating commercial availability and general-purpose design.

Pong, released by Atari in 1972, was a foundational video game that simulated a table tennis match with simple two-dimensional graphics. While not the very first video game ever created, its immense commercial success and widespread adoption in arcades demonstrated the viability and significant market potential of electronic gaming. This marked a crucial turning point, effectively launching the arcade industry and paving the way for future video game development and innovation. Space Invaders (1978), Pac-Man (1980), and Donkey Kong (1981) came much later, building upon the groundwork laid by Pong.

Charles Babbage, a British mathematician and inventor, designed two significant mechanical computing devices. The 'Difference Engine' was his first major endeavor, created to automate the calculation of polynomial functions and produce mathematical tables. However, his more ambitious and arguably more influential design was the 'Analytical Engine,' which he conceived later. The Analytical Engine is widely regarded as the first design for a general-purpose mechanical computer, featuring an arithmetic logic unit (the 'mill'), conditional branching, loops, and integrated memory. Although never fully constructed in his lifetime due to engineering challenges and funding issues, its architectural principles laid a theoretical groundwork for future digital computers. The 'Turing Machine' is a theoretical model of computation developed by Alan Turing, and the 'Harvard Mark I' was an early electro-mechanical computer built in the 20th century.

WordStar, first released in 1978, quickly became the leading and most commercially successful word processing software for microcomputers. It was particularly popular on the CP/M operating system and later on early versions of MS-DOS, dominating the market through the early 1980s due to its comprehensive features, macro capabilities, and widespread availability. While Electric Pencil (released in 1976) was an earlier word processor, it did not achieve the same level of market penetration or lasting commercial success as WordStar. WordPerfect and Microsoft Word rose to prominence in the mid-to-late 1980s and 1990s, succeeding WordStar as the industry standards.

COBOL (Common Business-Oriented Language) was designed in 1959 for developing business, typically finance-oriented, applications. Its syntax was designed to be English-like and self-documenting.

Created by Larry Wall, Perl gained widespread popularity in the 1990s as a scripting language for CGI (Common Gateway Interface) scripts on web servers. It is renowned for its powerful and flexible text manipulation features.

The correct answer is 1981. IBM introduced its first microcomputer, the IBM Personal Computer (IBM PC), on August 12, 1981. This seminal machine was powered by the Intel 8088 microprocessor, which, despite having an 8-bit external data bus, possessed a 16-bit internal architecture. The launch of the IBM PC was a pivotal moment, significantly contributing to the widespread adoption and standardization of personal computing.

The 1957 launch of Sputnik shocked the American political and scientific establishment. In response, the U.S. government formed the Advanced Research Projects Agency (ARPA) to ensure the nation would not be surprised by technological advancements again.

CSS (Cascading Style Sheets) is a style sheet language used for describing the presentation of a document written in a markup language like HTML. It controls colors, fonts, layout, and spacing.