the friendship

What is the friendship?What is the meaning of this relationship?
We heve always sought answers to these quetions,but we heve never come up to an adequate answer.
My friends,you should know that the friendship is not something you learn in school,but if you heven't learned the meaning of this relationship,you really heven't learned anything.
Being friends means being there for each other at all times,whether it is good or bad,and a friend always needs to be very understanding.Moreover,the meaning of the friendship is sharing unconditional the love for each other and its purpose is to make life's burdens lighter for our friends and not make them heavier.
Indeed,the true friendship can only be felt and expressed.so, very pure and essential something is not always visible to the eye,but it is felt by the heart.