By definition, an avatar is ‘an icon or figure representing a particular person.’
So, a client avatar is an icon or figure representing your business’s ideal client — your target audience.
In other words, they’re the person you’re creating your business for.
I know, I know — you thought you were creating your business for yourself, but you can’t have a business without sales and you can’t have sales without clients! ;)
So, you need to understand them inside and out, backwards and forwards. You should be able to pick them out of a crowd.
Client avatars help you visualize your ideal client so that you can understand them on a personal level.