Quite frequently, family histories are lost or destroyed over time. Now you have an opportunity to research your family history thanks to the US Government. The 1940 census records were released by the US National Archives April 2, 2012, and brought online through a partnership with Archives.com. This website allows you full access to the 1940 census images, in addition to 1940 census maps and descriptions.
These records were hand written. It is also important to have as much information about your ancestors as possible when tracking them. Old addresses are very helpful in insuring you mach up with the right people.