These are a commonplace sight on the battlefields of the 41st Millennium. For an infantryman, a tank is an awesome sight as it rolls across the battlefield. It will not only be immune to most of the weaponry carried by their squad, but it is able to bring to bear enough firepower to utterly eradicate him and their unit.
Most races field some kind of heavily armed and armoured vehicle, whether it be the huge and lumbering Leman Russ battle tanks of the Imperial Guard or the sleek and sophisticated grav vehicles of the Eldar. Tanks are often fitted for multi-role capability, and this will commonly include troop transportation as well as tank-hunting capability or infantry support with a deadly arsenal of weapons.
Imperial vehicles are often ancient in design, the basic plans having been rediscovered thousands of years ago, before the Emperor's ascension. Despite the antiquity of their design, their sheer ruggedness and versatility mean that they remain a match for enemy vehicles. Alien tanks are very different machines. Eldar combat vehicles are highly advanced; not only do they float above the ground using sophisticated anti-gravity engines, but they are also faster, more manoeuvrable and better armed than their Imperial counterparts. By contrast, Orks use crude contraptions that are almost as dangerous to their crews as they are to their enemies!