tDCS (Transcranial Direct Current Stimulation) is a non-invasive brain stimulation technique that uses a weak, constant direct electrical current delivered through electrodes placed on the scalp to modulate neuronal activity in targeted brain regions. By increasing or decreasing cortical excitability, tDCS is widely used in the treatment and rehabilitation of neurological and psychiatric disorders such as depression, anxiety, stroke, chronic pain, and for enhancing cognitive functions. Due to its high safety profile, low cost, minimal side effects, and no need for surgery, tDCS has gained significant attention in neuroscience research, psychological therapies, and clinical neurology, and is considered a modern and effective method of neuromodulation.