tDCS is used to treat mild clinical depression, while rTMS is used to treat mild to moderate clinical depression is a difference between transcranial direct current stimulation (tDCS) and repetitive transcranial magnetic stimulation (rTMS), which are used for treating psychological disorders
Explanation:
Transactional Direct Current Simulation (tDCS) and Repetitive Transcranial Magnetic Stimulation (rTMS). iDCS is also non invasive. It is short term seizure treatment. It is used to deal with depression, chronic pain, addiction etc.  TMS is noninvasive process that utilizes magnetic fields  to derive magnetic field.
During rMTS it sends electromagnetic to the brain without sensation of the pain. rTMS is used where talk treatment and medications won’t work. Both Transactional Direct Current Simulation (tDCS) and Repetitive Transcranial Magnetic Stimulation (rTMS) are cognitive way to deal with depression.