I've always thought that mold is the fungus, and to mould is to shape. When talking about it with my colleagues yesterday, I was surprised that this isn't common. Most people use one of the two spellings to refer to both.
Doing a quick search on duckduckgo also confirms that:
I'm not looking for what's correct or incorrect anymore, I just find it very fascinating that there are some people who use the words similarly to me, but the vast majority of others who use it in a different way.
So: what's the difference between mould and mold according to you?
I thought the same for the longest time. I blame playing tons of runescape as a kid.
I am an American so mold spelling is definitely what I ran into when referring to the fungus. Runescape is British English, so you used moulds all the time in crafting.