It runs user-made scripts (like auto-farming scripts, aimbots, or speed hacks) that change how the game behaves in real-time. The Current State of Roblox Executors (The Hyperion Era)

—essentially their level of permission within the Roblox engine: Roblox Wiki Levels 2–4 : Standard game scripts and LocalScripts.

Never run untrusted executors directly on your primary operating system. Use environments like Windows Sandbox to isolate the files.

Using these tools can lead to a permanent ban of your Roblox account.

A Roblox executor injects custom code into the Roblox game client. Roblox games run on a programming language called Luau. Executors exploit vulnerabilities in the client to run unauthorized Luau scripts, granting players powers or automation tools not provided by the game developers. The Current State of Roblox Exploiting

Features like Auto-Execute (which runs your favorite scripts upon joining a game) and Anti-AFK (which keeps you from being disconnected while idling) are staples of premium executors.