Sanded grout is just one of the two main types of grout available for construction use. Home builders use grout to secure the joints between tiles of various sorts. Laying the right grout with the right tiles needs careful consideration, depending on the type of project.
Sand can be added to all grout to supplement the strength in the tile joint. The amount of sand added depends on what sort of tiles you are using. If the tile joints are equal to or larger than 1/8th inch, sand should be used to increase the joint strength.
Ceramic tile grout needs less or no sand at all. If the joint is a thin joint between the set tiles and no greater than 1/8th inch, then there is less reason to use sanded grout. Non-sanded grout is usually Portland cement based. It also contains colored pigments and water retardant additives.
When you decide which grout to use, you should consider the size of the joints, the type of the tile, and the base upon which the tiles will be laid, for example, whether you are laying tiles on the floor or they are being set onto a wall.