Pexpect is a Python module for spawning child applications and controlling them automatically. It is primarily used for automating interactive applications such as ssh, ftp, passwd, telnet, and others, allowing developers to automate sequences that are traditionally manual. Pexpect works by watching the output from these applications and responding based on the expected patterns.This tool is particularly useful for testing, as it can emulate a user's actions in a repeatable and scripted manner. Pexpect can be used for automating any tool that requires user interaction, making it an invaluable resource in a variety of automation, testing, and administrative tasks.