What is a miraculous medal?

[carol_marie]

I read that some of you wear them and I’ve no idea what they are. What do they look like? Are their different ones or all they all the same? What do they do?

 

[Cherub]

Here is a good explanation of what the miraculous medal is:
Miraculous Medal

And here is a good picture of what it looks like:

Picture of Miraculous Medal