I think is an act where by people showed unconditional care and concern.
Accepting you, for who you are, even the ugly side of you.
Not leaving you when every others does.
Encourage, back you up when you're down.
Giving truthful comment even if it's not pleasant.
Being forgiving even if they did wrong.
Well is that real simple ?
Love is patient, love is kind. It does not envy, it does not boast, it is not proud. - 1 Corinthians 13:4
