A consistent relativistic kinematic description of a rotating disk is given. The disk is described from the point of view of an inertial observer momentarily at rest relative to a point on the periphery of the disk, and as observed in a coordinate system SS′ rotating with the disk. The kinematic resolution of Ehrenfest’s paradox is stated. Also the following elements of the description are analyzed: (a) the transformation of time from an inertial system, where the axis of the disk is at rest, to SS′; (b) the spatial geometry in SS′; and (c) the velocity of light in SS′. The procedure for synchronization of the coordinate clocks on the disk is stated explicitly.