The mass adoption of electric vehicles (EVs) presents an opportunity as well as a challenge for global energy systems. EVs result in reduced carbon emissions and the consumption of less fossil fuel, but in massive numbers, their integration into the power grid has the potential to frighten governments about energy demand surges and grid instability. Vehicle-to-grid (V2G) technology presents a game-changing solution by enabling the bidirectional exchange of energy between EVs and the power grid. This chapter addresses the concept of V2G, where EVs act as moving energy storage units, feeding electricity into the grid when demand is high and taking power when demand is low. V2G technology has some advantages, including grid balancing, enhanced integration of renewable energy, and lowering the cost to EV users. The role of smart charging infrastructure, artificial intelligence (AI), Internet of Things (IoT), and blockchain in optimizing V2G systems is also being touched upon. However, issues such as the degradation of batteries, regulatory barriers, and infrastructure limitations must be addressed to realize mass adoption. With the globe shifting toward a sustainable future, the use of V2G can enhance energy efficiency remarkably. Additionally, V2G technology can transform the energy industry by developing new economic models where EV owners can earn money by selling saved energy back to the grid.