What kind of adapter do I need to hook up a DVD player to my TV?

My tv is an old, heavy Sanyo with only one connection in the back (I’m assuming for cable). I’m going to buy a dvd player tonight, but I know that most, if not all require the three colored connections in the back of a tv (yellow, red, white). Will most dvd players come with the adapter I need for my TV, or will I have to buy it separately. I don’t know what it’s called, so a link might also be helpful. Thanks :)