A home that is considered in pre-foreclosure means that the owners are at least 90days behind in mortgage payments. In most cases, they are still living in the home trying to come up with a solution to their financial challenges.
A home that is foreclosed essentially means that the home owners would have not been able to pay their mortgage, or work with their lender to come up with a solution, and have lost their homes because if it.
I am not sure what information you may be looking for, but I would be glad to help you with that. I regularly work with buyers looking for foreclosed homes. It is often a popular choice because the price of the home is often discounted compaired to similar homes. But be careful, they are usually discounted because of work that may need to be done to the home. Feel free to contact me to discuss further.