In Wordle, when you make a guess that includes a letter that is present in the hidden word, but in a different position, the game will highlight those letters in yellow. This indicates that those letters are part of the hidden word, but not in the correct position that you guessed. For example, if the hidden word is "APPLE" and you guessed "LEMON," the game would show "L_E__" in yellow, indicating that "L" and "E" are part of the hidden word, but they are not in the positions you guessed. Using the yellow hints can help you narrow down the possible letters for each position in the hidden word, and make more educated guesses for your next attempt.