Can someone describe the cycling track?

Thanks so very much to those who gave me an idea about the pole vault. Fascinating to know more about these sports. Brings a whole new appreciation to me of what athletes do. I ran a bit of track in public and highschool so I know what a running track is like. I do not know what a track cycling track is like though. The velodrome. They said it was made from Canadian wood (the one in London that they are using now) but what is it like? It sounds like it is not flat like a running track but I am not sure.