What is Kidney Cancer?

I am doing a project for my 8th grade science class, and it was based on viruses and diseases. I chose cancer. But although I do know what’s cancer(and I am almost done with the project, I have done lung cancer, skin cancer, melanoma, breast cancer, and Leukimia), I still have kidney cancer, and I have done a bit of a research(I even tried britannica, wikipedia, and most of the websites from google) but its a bit confusing to me. So please help me out(the project is due on March 11, 11)and I would be waiting.
PS: Did I mention the project structure is a informational booklet?
PPS:you can be funny if you want to be, but please also provide me with some information!