Executable describes a computer file that contains instructions a computer can run directly, like clicking on a game icon to start playing. When you double-click an executable file, your computer reads its code and performs whatever actions the program was designed to do: opening a word processor, launching a web browser, or starting a video game.

Programmers write code in languages humans can read, then use special tools to convert that code into an executable file the computer understands. On Windows computers, executable files often end in .exe (like “minecraft.exe”). On Mac computers, they might be hidden inside application folders or have no visible extension.

The word can also work as a noun: “Download the executable and run it to install the program.”

Outside computers, executable means something capable of being carried out or accomplished. A teacher might review your project plan and say, “This looks executable,” meaning it seems realistic and doable with the time and resources you have.

Not all computer files are executable. A document, photo, or music file just contains data. An executable contains instructions, commands that tell the computer what to do. That's why computers warn you before opening executable files from unknown sources: they have the power to change your system, for better or worse.