question about data structure

This image is not mine.It is from wikipedia.May someone explain me with a simple way what are keys, hash functions and buckets in data structure?

thank you

I havent any backround in computer programming

You might try this. But it might be a little “low level”.

If that page is too complex, let me know and I’ll try to explain on my own.

thank you very much fire-eggs!!!I understand that you help me with the best of your abillities