Somebody knows to define what it is Bandwidth Usage IN and Bandwidth Usage OUT, my server this month already Total In 778,18 GB and Total Out 804,55 GB I am needing aid to know more on bandwidth.

I wait return.

That is, in laymens terms, the data coming onto your server, and the data leaving your server.
Unless you have a VERY high-performance server, I would suggest contacting Ev1 immediately and requesting that they perform a bandwidth audit on your server and your switch, as they charge something like $0.50 a GB for overages.