How do you make an image that can be updated without changing the html code?

I know people have done it. I want to know how to make it so that if i want to change a picture to update itself when i have a newer pic people who have it linked don’t have to change the html code. Like a club penguin tracker!
but what file host does I use?

Just make sure the new one has the same name (like Image.jpg) and upload it to the same folder. You’ll over write the old one, or you can change it’s name first.

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