Depression is a condition that most people will suffer from at different points in their lives. It is usually marked by a feeling of continuous despair, low mood, and disinterest in everyday activities.
There are a variety of causes for depression, and one can be afflicted by it for weeks, months, and even years. Depression can lead to suicidal thoughts.
If you or someone you know suffers from depression or you/they are at risk for harming yourself/themselves because of depression, it is highly suggested that you seek help or treatment for it.