A programming language is a formal language comprising a set of instructions that produce various kinds of output. Programming languages are used in computer programming to implement algorithms. Most programming languages consist of instructions for computers.

- JavaScript: It’s impossible to be a software developer these days without using JavaScript in some way. According to Stack Overflow's 2019 Developer Survey, JavaScript is the most popular language among developers for the seventh year in a row. Nearly 70 percent of survey respondents reported that they had used JavaScript in the past year.