There is no need for confusion or problems brought about by misidentification of a surface type, yet it happens all too often.
Finishes vary greatly - smooth, stone pattern, sandblasted, etc.
Tile are either wet cast, extruded, or pressed. The concrete is anything from regular aggregate concrete to various mixtures of light weight aggregates. Usually colored with iron oxide pigment at the surface, or throughout the mixture. Removing grout residue with acidic cleaners is risky for concrete surfaces. It also prevents grout trapping in the texture.