Grout is a material made that is typical cement based and can be used for filling the gaps in everything from masonry walls, pre-cast concrete flooring to tiling in a home or building. When used in a home for tile the grout is pushed and smeared over the tile with a grout tool to make sure that all of the spaces and gaps are completely filled with the grout. In most cases the grout is then wiped off with a damp towel and then allowed to dry before a final cleaning. In some cases the grout is left as applied until completely dried and then the excess removed.
If you find that you need a new tile floor or need help improving on your current tile job, you might find that a professional can help you get the best results. They will be able to help you remove old tiles to replace new ones and apply the proper grout for the job. In some cases you might want shrinking grout while others might call for a standard grout. The color of the grout is also important to the aesthetic of the room and the tile or masonry it is being applied to. A professional will be able to help you choose the grout that is going to dry to the color you want.