The files after extracting a tar

I recently start to use tar to backup my files on macOS.

I usually use:

tar cvf archive.tar foo bar

and i also run this to check:

tar tvf archive.tar 

It would show the following and it seems okay:

-rw-r--r--  0       6 Jan 20 22:40 foo-rw-r--r--  0      13 Jan 20 22:40 bar

However, It seems likes this on Windows.

-rw-r--r--  0       6 Jan 20 22:40 ._foo-rw-r--r--  0       6 Jan 20 22:40 foo-rw-r--r--  0      13 Jan 20 22:40 ._bar-rw-r--r--  0      13 Jan 20 22:40 bar

I'm confused about the result.

Why it would output ._foo and ._bar? Where are they from?

How could i make an archive.tar only output foo and bar without ._foo and ._bar?