Answer : 4. "Chrome"
Explanation :

1. Chrome is a browser developed by Google.

2. It was first released in 2008 for Microsoft Windows with free software components from Apple WebKit and Mozilla Firefox.

3. It was later ported to Linux, macOS, iOS, and Android, where it is the default browser built into the OS.

4. The browser is also the core component of Chrome OS, where it serves as the platform for web applications.