Execution policy is a security feature that controls which PowerShell scripts can run on a system. It helps prevent malicious scripts from executing accidentally.

Execution policy levels:

• Restricted: No scripts can run (default on client systems)
• RemoteSigned: Local scripts run freely; remote scripts must be signed
• AllSigned: All scripts must be digitally signed
• Unrestricted: All scripts run with warnings for remote scripts
• Bypass: Nothing is blocked; no warnings
• Undefined: No execution policy is set