Tivo device

I am going to add an ESPN package to my current basic Time Warner Cable plan. I got a cable card from TWC store. The technician suggested me buying a TIVO device or CETON something like and insert the card to it. It is my first time heard about TIVO. I have no idea of it.

What should I buy?
And Do I have to pay monthly fee for TIVO service?

Thanks for advice.