Imagine you have a letter and you want to add a little circle on top of it. But instead of putting the circle on top, you put it on the right side of the letter. This little circle on the right side is called a modifier letter right half ring.
It can change the sound of the letter it's attached to. For example, in some languages, adding the modifier letter right half ring to the letter "o" can change it to a different vowel sound like "ö".
Overall, the modifier letter right half ring helps us write and pronounce words in different languages more accurately by showing us how to change the sound of certain letters.