What is 'Negative Prompts'

[SingingTurnip]

Can someone explain like I am 5 what a negative prompt is please?

Thanks.

[ophoria]

It does the opposite of what your promt does.

[ClashSAN]

If you want an green apple:
Prompt: "apple"
You could put things you don't want to see as negative prompt
Prompt: "apple"
Negative Prompt: "red, deformed, ugly, phone, company"

You will probably want to edit the positive prompt too:
Prompt "closeup of green apple"
Negative Prompt: "red, deformed, ugly, phone, company"

You don't have to always use the negative prompt. "A closeup of green apple" would usually be enough. If you are doing alot of pictures - eg: If I was doing batches of say.. tiles, and I wanted anything but green, then adding "green" to negative prompt would be really useful.