Examples
This image example shows that the "w or W" is in the right spot (because the tile has turned green) & exists inside the word you're trying to guess.
This image example shows that the "i or I" is in the wrong spot/location (because the tile has turned yellow), but exists inside the word you're trying to guess.
This image example shows that the "u or U" does not exist in the word you're trying to guess (because the tile has turned gray).