Tanks played a very important part in the last Gulf War, and will do this time as well.
The main British tank is the four-man Challenger II.
It has been changed to work in the desert, and it will keep its crew will be safe inside it if there is a bio-chemical attack.
The USA has the four-man Abrams tank.
It is very well protected and can reach speeds of 42 mph (62 kph)
The Iraqi Lion of Babylon tank was easily beaten by American tanks in the first Gulf war.
Not much else is known about what kind of tanks that Iraq has.