[Python] Why do i have to convert "uint8" into "float32"

I just started looking into deep learning and started to build a CNN with Keras.

So I've noticed that oftentimes when the Dataset MNIST is used, after importing the images, they are getting converted to float32-Datatype.

So my question is, why is that the case? It seems like it should work fine with uint8-Data. What am I missing here? Why is float32 needed?

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