A vector graphic can be made larger or smaller without any loss of quality. While a normal graphic (like a picture) loses quality. it's a very common format for logo's, and I'm sure your website designer and printer can handle it.

If you feel you need a jpg, png or gif for some reason, that freelancer surely can provide that in addition to the vector graphic. But you can make those also using any picture editor, like irfanview (free).