What difference does it make with or without the target attribute and what other value can one input in the target attribute

Answer 1

If you are using frames in your webpage, you can name them and then make the target open a new page inside that frame.
Frames usage is obsolete though in HTML5.
https://www.sololearn.com/learn/HTML/1037/

Answer 2

Target attributes:
_blank -- new tab
_self -- same tab
_parent -- parent tab
_top -- top tab
or the framename, if you are using them.
Check out the comments in the third leason here:
https://www.sololearn.com/learn/HTML/1031/

Answer 3

Thank you

Answer 4

But what is framename?