A grout float is a hand tool used in tile installation to apply and spread grout between tiles. It typically has a flat, rectangular base made of rubber or foam, which helps to evenly distribute the grout while filling the gaps. The handle is usually positioned at a right angle to the base, allowing for better control and leverage during the application process. Using a grout float is essential for achieving a smooth and even finish. After applying the grout, the float can also be used to remove excess grout from the tile surface, ensuring that the tiles remain clean and free of residue. Proper use of a grout float contributes to a professional-looking tile installation.