What is Public_html?

I AM NEW TO THIS SO ANY HELP WOULD BE GREATLY APPRECIATED!

I AM TRYING TO MOVE MY EBOOKS WEBSITE TO THE INTERNET AND WAS TOLD BY THE PERSON WHOS HELPING ME THIS UP THAT I NEED TO MOVE MY FILES TO THE PUBLIC_HTML FILE LISTED IN THE REMOTE BROWSER. HOW DO YOU GET IT TO APPEAR? AS OF NOW I JUST HAVE A FILE THAT SAYS "INCOMING" AND SO FAR HAVE NOT BEEN UNABLE TO UPLOAD ANYTHING TO THE WEB USING IT. IT JUST KEEPS TRYING OVER AND OVER TO UPLOAD THEM. AM I MISSING SOMETHING?

THANKS IN ADVANCE!