What is a quit claim?

[Marquell Jones]

hello again bigger pockets family. There is a townhouse that is 2bed/2ba on corner lot. The people that were living there has not been there for maybe 6 months and there is a big Green trash dumpster there. I did a lil research and a real agent told me that an investment group owns it and there is a quit claim on the house. What does this mean? And how would I be able to own this property? 

Thanks