The periodic table of programming languages visualizes the evolution of popular programming languages over time. It arranges languages by decade in rows, with the earliest mechanical systems in the top row from the 1830s-1950s. Each cell represents a language and is color coded by its original or primary programming paradigm such as imperative, functional, object oriented, and concurrent. The table tracks the emergence and proliferation of languages from the earliest days of computing to modern languages in the 2000s row.