[Html] Open link in new tab or window
It shouldn't be your call to decide whether the link should open in a new tab or a new window, since ultimately this choice should be done by the settings of the user's browser. Some people like tabs; some like new windows.
_blank will tell the browser to use a new tab/window, depending on the user's browser configuration and how they click on the link (e.g. middle click, Ctrl+click, or normal click).
This question already has an answer here:
Is it possible to open an
a href link in a new tab instead of the same tab?