Think of depression as a stuck neural circuit, a stuck neural network. Just like your computer has circuits to run an app, your brain has different neural networks for everything you think, feel and do.
Every feeling runs across its own neural network, icluding sadness. When the sadness neural network gets stuck, just like an app can get stuck on your phone or computer, we call it depression. Depression is a stuck neural network.
The stuckness is what makes depression especially hard.
TMS (Transcranial Magnetic Stimulation) uses a gentle magnetic pulse to release the stuck depression neural network. This allows you to have a full range of feelings and not be "stuck."