Transcranial direct current stimulation (tDCS) is a non-invasive brain stimulation technique that involves applying a low-intensity electrical current to the scalp to modulate neural activity in the brain. This technique has been studied for its potential therapeutic applications in a variety of neurological and psychiatric disorders, as well as for enhancing cognitive function in healthy individuals. Research on tDCS encompasses studies on its mechanisms of action, optimal parameters for stimulation, and its efficacy in various clinical and cognitive domains. Overall, tDCS is a promising tool for modulating brain activity and has the potential to be a valuable therapeutic and cognitive enhancement intervention.