What is rel=”noopener” tag?

[websiteee]

A rel=”noopener” is an HTML attribute that’s added to all WordPress links that are selected to open in a new browser tab. This feature was introduced in WordPress to address a security vulnerability which can be exploited by malicious websites.

or

rel="noopener" prevents the new page from being able to access the window.opener property and ensures it runs in a separate process.