It’s like a magic box that does a specific thing, and let’s you put anything in, and outputs another thing that has that initial thing applied to it.
Let’s say f(x) = toaster
If I do f(bread), I’m inserting bread into the toaster, and I’m going to get toast
If I do f(bagel), I’m inserting a bagel into the tater, and I’ll get a toasted bagel
You could think about the “cloud to butt” plugin on a web browser that replaces every instance of the word “cloud” with “butt”
f(cloud) = this is a sentence with the word cloud in it
f(butt) = this is a sentence with the word butt in it
I hope that the non-math examples help.
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