What's the difference between sadness and depression?

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Burnout-From-Work
Stress-and-Burnout
Workplace-Burnout
Mental-Health-Burnout
Worker-Burnout
Job-Burnout
Stress-vs-Burnout
Avoiding-Burnout
Employee-Burnout
How-to-Avoid-Burnout-at-Work
Burnout-Signs
Compassion-Fatigue-vs-Burnout
Teacher-Burnout
Causes-of-Burnout
Burnout-Psychology
Physician-Burnout