Apologetic apostrophe

Okay, imagine you are writing a letter to your friend and you are talking about someone named Lily. But, when you write "Lily's", you accidentally add an extra letter and write "Lily's'". Oops! That is called an apologetic apostrophe. It's like saying sorry to the letter itself for making a mistake. But don't worry, everyone makes mistakes sometimes and you can just erase the extra apostrophe and fix the word to be "Lily's".