Windows Defender SmartScreen aids in the overall security of your computer by warning you before starting unrecognized apps and opening files downloaded from the Internet.

SmartScreen

A feature in Microsoft products that helps protect against phishing and malware by screening web content and files.

Unrecognized Apps

Applications that an operating system or security software does not identify as safe or known, often prompting a warning to the user.

Downloaded

The process of receiving data from a remote system, such as a server, through the internet or a local network, typically for local storage or use.