What is the difference between fluorescence and emission spectroscopy?

What is the difference between fluorescence and emission spectroscopy?

They seem to be the same, only the source of energy differs?
Update: What is the difference between atomic fluorescence spectroscopy, and atomic emission spectroscopy?

Are they not two different methods? They both measure energy relesed, but what other types of emission apart from fluorescence is there? Why is the energy source different?
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