Haha, I meant, the practical idea behind their usage. The example of OCR via a NN was very good in drilling that concept into my head (many inputs leading down

Haha, I meant, the practical idea behind their usage. The example of OCR via a NN was very good in drilling that concept into my head (many inputs leading down to output). The HOW (in capitals) they work bit - I'm not going there. This thread here got me searching and I'm reading through the basic TensorFlow docs. That's, so far, sinking in.