It will be the first mission to combine the capability to move across the surface and to study Mars at depth.
The primary goal of the ExoMars programme is to address the question of whether life has ever existed on the red planet.
The first part of the programme was launched in March 2016 with the Trace Gas Orbiter. The second part is planned for launch in 2020 and comprises the rover and surface science platform.
ExoMars is a joint endeavour between ESA and the Russian space agency, Roscosmos.