What mean of target=_blank

Answer 1

The target attribute specifies where to open the linked document.
The _blank value opens the linked document in a new window or tab.

https://www.w3schools.com/TAgs/att_a_target.asp

Answer 2

https://www.w3schools.com/tags/att_a_target.asp
https://html.com/attributes/a-target/
https://css-tricks.com/use-target_blank/

Answer 3

Link has to open in a new window (tab).