What is depression?

When you are sitting with your friends joking and laughing your heart out but then suddenly in the fraction of a second you realise that you have everyone to laugh with, enjoy with But there is no one not a single person to share your pain with or who can understand you or what you are going through and then in the next moment you are hiding your tears and the voice which has muffled because you are crying internally. That to me is pain and the height of sadness which looms over you for life long and dooms you in depression. 

May be to some extent it might be cured but it won’t leave. It’s there to stay and keep nagging you from time to time that I am there, like your bestie because there is no one else other than me for you. From peop