# What is the difference between emission spectrum and diffraction pattern?

What is the difference between emission spectrum and diffraction pattern?
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Seromaniaru
A diffraction pattern is the result of passing a light beam through a diffraction grating. This is similar to passing a light beam through a prism. It allows you to see the spectrum of the light visualised.
An emission spectrum is a particular kind of spectrum associated with - you guessed it - the emission of photons from atoms.
The two are closely related in the sense that a diffraction pattern - much like the result of passing a beam through a prism - can be used to visually inspect the spectrum of the light. But a diffraction pattern is not tied to any particular source of light (emission, absorption, laser, etc) any more than a prism.