Spectral Lines:Spectral lines are specific wavelengths or colors within an emission or absorption spectrum that correspond to transitions between different energy levels.
Absorption Spectrum: An absorption spectrum is created when certain wavelengths or colors are absorbed by an element, resulting in dark lines on a continuous spectrum.
Electron Transition: An electron transition occurs when an electron moves from one energy level to another within an atom, either absorbing or emitting photons in the process.