Meaning: A photographer’s instruction just before taking a picture.
“Cheese” contains the phoneme /i/, a long vowel which makes our lips stretch to make a smile. Despite exhaustive etymological delving, no one has found any literal link between the ‘say cheese’ expression and actual cheese. Some say that it comes from the British saying “quite the cheese.” Or in any case, saying cheese simply forces your lip to smile as you say it.
Keep smiling. It makes the world wonder what you’ve been up to. -Author Unknown