the word sad is one of the reactions that arise from within because of seeing or feeling something that is not good.
Sad can be due to disappointment with someone, or we make mistakes that can hurt others.
At such times we cannot express directly what we feel to others.
And we look for something so that other people can understand what we feel.
We can express via display picture or dp Sad.
We will look for the Sad DP that is right to reveal it.