How does a CNN work?

How does Convolutional Neural Network "CNN" work?

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How does a CNN work?
How does a convolution work?
Why do we use convolution in neural networks?
Why does CNN work?
How many layers does CNN have?
What is the benefit of CNN?
Why CNN is better than neural network?
What exactly is convolution?
Is CNN a algorithm?
Is CNN used only for images?
How many layers should a neural network have?
Is CNN a classifier?

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