Tarot cards are used for all sorts of purposes. Divinations, games, even as spell cards in some gaming systems. There are dozens upon dozens of types of readings as well, 15 of which you'll find below, but more will likely be added in the future, especially if there's a demand for it.
The tool is easy to use. Simply click 'Shuffle deck' to shuffle it, then click on any of the spread icons to have it deal the chosen spread, or click 'Draw single card' to draw a single card instead. Cards can be upside down (reversed), which is important in many readings.
Note that the deck will run out of cards, so you'll have to reshuffle them periodically.
Once you've picked a spread you can reveal the cards one at a time by clicking on them, or all at once by clicking the 'Reveal all' button. You can then click on each card to find out their rough meaning down below, as well as what each card in the spread roughly stands for in that particular reading. If you're new to tarot readings, I do recommend reading up on a specific reading first.