Grout

Grout is a dense substance that flows like a liquid yet hardens upon application, often used to fill gaps or to function as reinforcement in existing structures. Grout is generally a mixture of water, cement, and sand, and is frequently employed in efforts such as pressure grouting, embedding rebar in masonry walls, connecting sections of precast concrete, filling voids, and sealing joints such as those between tiles. Common uses for grout in the household include filling in tiles of shower floors and kitchen tiles.

It is often color tinted when it has to be kept visible and sometimes includes fine gravel when being used to fill large spaces.
Unlike other structural pastes such as plaster or joint compound, correctly mixed and applied grout forms a water-resistant seal.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain