Electronic couplings refer to the interactions between electrons in different molecular or atomic states, and play a crucial role in various physical processes, such as charge transfer, energy transfer, and electron transport in materials and devices. Understanding and quantifying electronic couplings are essential for designing and optimizing electronic devices, such as solar cells, organic light-emitting diodes, and molecular electronics. Experimental techniques, theoretical modeling, and computational simulations are commonly used to investigate electronic couplings in different systems and materials.