Infill is mainly the material which is needed to hold the turf in the ground. These are the granules which are disrupted all over the place, even between the empty positions from one grass plant to another. This is called infill, the common infill materials which are used for turf are silica and rubber. They are non-absorbent and non-toxic infill.
Infilling accurately keeps the delicate fibres of turf from rupturing and getting damaged. These also provide shock absorbency for playgrounds or sports fields.