What is epoch?

What is an epoch used in neural network? For example there are 3000 epochs of iteration. What does it mean?

Answer 1

[Jiro Doke]

From to the glossary:

epoch - Presentation of the set of training (input and/or target) vectors to a network and the calculation of new weights and biases. Note that training vectors can be presented one at a time or all together in a batch.