Node-pty is a Node.js library that provides bindings for the `forkpty(3)` system call, enabling developers to create pseudoterminal (pty) processes. It is primarily used for building terminal emulators, such as those found in Visual Studio Code, Hyper, and other applications that require terminal functionality. The library supports Linux, macOS, and Windows, and is designed for developers working on terminal-related projects or applications that need to interact with terminal-based programs.