A coordinate is the position of an object in a coordinate system, relative to the corresponding axis. In a two-dimensional coordinate system, points are usually expressed as a coordinate pair, also called ordered pair, which is denoted by $(x,y).$ The first coordinate states the position along the $x\text{-}$axis and the second coordinate states the position along the $y\text{-}$axis. In a three-dimensional coordinate system, three numbers are needed to express a coordinate position. Each number tells the point's position in relation to one axis. A coordinate point in three dimensions is also referred to as an ordered triple and denoted by $(x,y,z).$ The same reasoning applies for coordinate systems with more than three dimensions.