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What exactly is Kosher salt? is it better than regular salt I know it is bigger than table salt

No. It's not really better. They are both about the same.

Kosher salt is a pure salt that is a fairly large-grained salt, that was originally used in the process of making meat kosher. Any salt can be kosher if it’s produced under kosher, (Rabbinical), supervision, but it’s not because of Jewish dietary guidelines that kosher salt got its name. In fact, something labeled “kosher salt” can actually not be kosher at all!

Kosher salt’s original purpose was really to kosher meat, meaning to remove the blood from meat, so it’s really koshering salt. Certain salt companies labeled the boxes of this coarse salt kosher salt rather than koshering salt, and the name stuck.