Time-resolved spectroscopy involves the study of light-matter interactions over a range of time scales. To describe this technique, several synonym phrases can be used. These include time-resolved fluorescence, time-domain spectroscopy, time-correlated single photon counting, laser-induced fluorescence, and transient absorption spectroscopy. These phrases define different aspects of the same experimental process, with each phrase highlighting specific features of the data being collected. Time-resolved spectroscopy is a powerful tool that allows researchers to investigate the dynamics of chemical reactions, photochemical processes, and biophysical phenomena, making it valuable for a wide range of research fields including chemistry, biology, and materials science.