Divination means to forsee, to predict the future.
I use tarot and pendulum mostly, with pendulum being the tool I feel most comfortable with. I also have a crystal ball, but I rarely use that, although when I have used it the results have been pretty good. I have tried scrying with a mirror, but couldn't get the hang of that. I have rune stones, but rarely use them.
Besides the tarot and pendulum I am also a very good dream interpreter and have forseen many things this way too - most notably the deaths of four loved ones. Symbolism in dreams can be confusing with people not understanding what connection random symbols have with each other. But if you look at what symbols in dreams mean to you and then spend some time thinking it over you have your own divination tool that is hugely personal to you.