Programming language
Also known as: coding language, programming languages, computer language
A programming language is a set of words, symbols, and rules that people use to write instructions for computers.
Different languages suit different jobs: JavaScript runs in web browsers, Python is popular for data and AI, Swift and Kotlin build mobile apps, and C and Rust power operating systems and devices. While there are hundreds of languages, learning one well makes picking up others much easier, since the core ideas carry over.
Programming language, explained at three levels
At home
A programming language is like a language for giving directions to a very literal friend. You must spell out every step exactly, or they'll get lost.
At work
The programming language a system uses affects hiring, maintenance costs, and how easily it can be updated.
At home
Python is a popular first language because its code reads almost like English. JavaScript is a good choice if you want to build websites.
At work
Languages differ in speed, safety, ecosystem, and talent availability. Choosing mainstream languages makes hiring easier and reduces long-term risk.
At home
AI tools can write code for you, but understanding a language helps you spot mistakes. In my opinion, learning the basics is still worth it.
At work
Standardize on a few languages per domain, favour memory-safe languages for new systems, track legacy language risks such as COBOL skills shortages, and evaluate libraries and community health as part of language choices.
Real-world examples
At home
Carlos wanted to automate his budgeting spreadsheets. He learned basic Python over a few weekends and wrote scripts that saved him hours.
At work
Nadia is CTO of a Toronto startup. She chose widely used languages so the company could hire developers easily as it grew.
How it compares
| feature | Python | JavaScript | C |
|---|---|---|---|
| Best known for | Data, AI, automation | Websites and web apps | Operating systems, devices |
| Beginner-friendly | Very | Fairly | Less |
| Speed | Slower | Moderate | Very fast |
| Runs in browsers | Not natively | Yes | Not natively |
Each language fits different jobs. The basics transfer between them.
For analysts
In technology choices, I'd weigh the talent market as heavily as technical merits. A brilliant system in an obscure language can become a maintenance trap.
History & origin
Ada Lovelace's 1840s notes on Charles Babbage's Analytical Engine are often called the first computer program. FORTRAN, released by IBM in 1957, was the first widely used high-level language, followed by COBOL in 1959, influenced by Grace Hopper. Dennis Ritchie created C at Bell Labs around 1972, and later languages such as C++ (1985), Python (1991), Java and JavaScript (both 1995), and Rust (1.0 in 2015) followed. GitHub reported in 2024 that Python had become the most used language on its platform, and in 2025 that TypeScript had taken the top spot. AI coding assistants now let people describe software in plain English, though programming languages remain underneath. In my view, programming languages are tools, and the best one is whatever solves your problem.