define affix but make the definition simple

An affix is a small word part that is added to the beginning or end of a word to change its meaning.

Sure! An affix is a small part (like a letter or group of letters) that is added to the beginning (prefix) or end (suffix) of a word to change its meaning. For example, adding the prefix "un-" to the word "happy" changes it to "unhappy," which means not happy. Similarly, adding the suffix "-er" to the word "teach" changes it to "teacher," which is a person who teaches. So, an affix is like a puzzle piece that you add to a word to create a new word with a different meaning.

An affix is a small group of letters added to the beginning or end of a word to change its meaning or create a new word.