Why is the plural of photo photos not photoes?

Answer 1

The plural form photos is an exception to the rule that words which end with -o preceeded by a consonant have -es added to create the plural form.

Answer 2

The word "photo" is a shortened form of "photograph," which ultimately comes from the Greek word "phōtos," meaning "light." When forming the plural of a noun ending in a vowel followed by "o," like "photo," the standard practice in English is to simply add an "s" to the end. The plural form "photos" follows this rule, while "photoes" would not be considered correct in English grammar.

Answer 3

We add 's' instead of 'es' to the word photo to make it plural whereas we all know that words ending with 'o' if proceeded by a consonant usually takes 'es' to be plural. But photo is not a full word, it is contracted form of the main word 'photograph'. So only 's' is added to this word to make it plural.