Grouting is an act or process of applying grout or of injecting grout into grout holes or crevices of a rock. It is simply the injection of fluids or fluid suspensions into the joints of a rock under pressure for the purposes of reducing the hydraulic conductivity of the rock mass or for improving the strength of the rock mass. In order to inject grout, holes are drilled to the required depth usually with rotary-percussion holes. It is broadly defined as the placement of a pumpable material, which will subsequently set, or gel in pre-existing natural or artificial opening or in openings created by the grouting process.