<div>When you review cards in AnkiApp, after seeing the front side of a card and hitting "Flip", you're given 4 options to indicate how well you knew what would be on the back side of a card.</div>
<p></p>
<p><img width=340 height=50 alt="review buttons" src="https://static.ankiapp.com/790ce784da04f8c6a8d72a11f28ca661418fbe20" /></p>
<p>This is what those options mean:</p>
<table>
    <tbody>
        <tr>
            <td class=""><b><i>Fail</i></b></td>
            <td class="current">When you flipped the card, it wasn't what you expected.</td>
        </tr>
        <tr>
            <td class=""><b><i>Hard</i></b></td>
            <td class="">When you flipped the card, it was what you expected, but you weren't sure it would be.</td>
        </tr>
        <tr>
            <td class=""><b><i>Good</i></b></td>
            <td class="">When you flipped the card, it was what you expected, but it didn't come to you fluently.
            </td>
        </tr>
        <tr>
            <td class=""><b><i>Easy</i></b></td>
            <td>When you flipped the card, it was what you expected, and it came to you fluently.
            </td>
        </tr>
    </tbody>
</table>

*Fail*	When you flipped the card, it wasn't what you expected.
*Hard*	When you flipped the card, it was what you expected, but you weren't sure it would be.
*Good*	When you flipped the card, it was what you expected, but it didn't come to you fluently.
*Easy*	When you flipped the card, it was what you expected, and it came to you fluently.

What do the self-grade buttons ("Fail", "Hard", "Good", "Easy") mean?