Brushed Travertine

We recently installed travertine in our kitchen, sunroom, foyer and bathrooms. It is absolutely gorgeous. The company we purchased it from (Build Direct) calls it "brushed" travertine. The brand is Kesir, and we bought the Meandros Walnut in an Antique pattern. Here is the description from the BuildDirect: "The Kesir Meandros Antique Travertine Tiles product line consists of high quality brushed and chiseled travertine tiles in a rustic antique pattern. The brushed surface and chiseled edges give the appearance of travertine that has been gently worn by centuries of use. This tile is perfect for those looking for the rich, traditional feel of an Italian villa. The Meandros Antique Pattern is equivalent to unfilled Oasis Grade." A professional installed it and we are totally in love with it. Since we know it is not polished, what exactly is "brushed" and is it a good choice for the areas we selected? Any special concerns with this type of travertine? Should we seal with MB-4 in all the areas, or just the kitchen? Thanks so much.