The A7V was an armoured assault vehicle introduced by Germany in 1918. first being used in combat during March 1918. Of the 100 ordered only 20 were delivered before the end of World War One. The Germans were unconvinced of the potential of armoured vehicles and did not have any great expectations of the concept; they fielded fewer than 100 tanks during the war, mostly captured British or French vehicles.
The A7V's armour plating was standard unhardened steel that was proof against small arms fire but not anything heavier. The speed was slow but typical of most similar vehicles in it's class. It had a poor cross country performance but could be usefully employed on reasonably smooth terrain.
Some footage about World War One Tanks