File extensions

C language source from 1972. Foundation of the Linux kernel, all major databases, and countless system programs.

C++ source. Still dominant in operating systems, game engines, finance, and embedded work where performance matters.

Source for Google's Go language. Known for lightweight goroutine concurrency and statically-linked single-binary output.

A C or C++ header file. Declares types, function prototypes, and macros pulled into other sources via `#include`.

Source for the Java language. Compiles to `.class` bytecode that runs on the JVM.

JetBrains' JVM language. Google's preferred language for Android and a more concise alternative to Java on the JVM.

Server-side PHP source. Powers a huge slice of the web via WordPress, Laravel, and classic LAMP stacks.

Python source code. Ubiquitous in data analysis, ML, automation, and backends — runs on every mainstream OS.

Source for Ruby, Yukihiro Matsumoto's dynamic scripting language. Rails brought it into the web-development mainstream.

Source for the Rust systems language — memory safety without a garbage collector, powering web backends, CLIs, and even kernels.

A text file of SQL statements — queries, DDL, DML — used for backups, migrations, and ad-hoc analysis.

Source for Apple's modern Swift language. First-choice for iOS, macOS, watchOS, and tvOS apps.

Microsoft's typed superset of JavaScript. The de-facto standard for serious front-end and Node.js projects.