Severe depression is a mental health condition where a person feels extremely sad, hopeless, and overwhelmed for a long time. It's like feeling stuck in a deep, dark hole with no way out. Simple tasks become very hard to do, and everything might seem pointless. People with severe depression often lose interest in things they used to enjoy, have trouble sleeping or sleeping too much, and might even have thoughts of harming themselves. It's important to remember that severe depression is a serious illness, but with proper help and support, many people can overcome it and feel better.