You have read the answers below regarding the process of a foreclosure/auction. However, it's also helpful to know that foreclosure properties are usually sold "as is." meaning that no repairs or requests for repairs or credits will be given to the buyer, and no survey is provided. Taxes are usually pro-rated at 100% of the most recent bill, and usually proof of funds is required.
Foreclosure/auction properties can be good opportunities, but it's important to be knowledgeable about the property values in the area. A buyer should also have flexibility in terms of time, as in these transactions, they have less control than in a regular sale.