You guys gonna agree with it or not but i believe

 

In this populous world, everyone is alone. Whatever we love and we think that it will remain with us through our life, doesn't remain. Even one day our parents will also leave us alone. Although then you guys will say that we'll have our partners, children etc..

But at some time everyone has to quit from our life's drama. So to fulfill that void, I think friendship is made for. Here, I want to be specific with friendship not with friends. Even friends too can not stay with you for all of your life. Friendship is sense that we're not alone. There is someone who somewhere cares for us. Friend is another name of mutual understanding, our habits and our situations makes our friends not we. 

Idk with what aspect your asking about the definition/meaning of friendship but in general, friendship is all about understanding each other. It is just a give and take business with trust on each other in which it is you (friends)who decides that at what level you can take your trust.
I know you ain't gonna read it down here but at last friendship is pure relation just as mother and son's relation. In this both should walk parallelly on the track of life with equal proportion of sacrifices.

I even don't know that it is worth of reading or not, but I think I should write this. May be I'm dreaming or I'm in a real world. But life what I'm spending/living is little bit confusing for me.
Once I wrote a thought "life is confusing for those who try to understand, compulsion for those who care and heaven for those who don't care. I don't know what other philosophers think but I think we have no existence. Because except some of great people, all others are born to die. We all know, we all are not immortal, we live here for about 70 to 80 years hardly 100 years and then die. We compete, we run, we try to survive but for what? What's our ultimate Goal?  In my view, nothing. We are built by our society, we are following the same only what our society has programmed in our minds. Some of us are and some of us will programme the same to our offsprings and they will follow the same, though they would be more advanced but their basic routine will be same, same competition for unknown destiny. It's a cycle, our ancestors planted these traits in us and we'll carry them to our offsprings and our offsprings will transplant to their offspring and this circle will work continuously.
Most of us think that life is a journey of an unknown destiny or we can say -for an ultimate destiny "last breath".

It's human nature to find something fake to be happy, like boys likes to have girlfriend, young adults like to marry and other likes to have materialistic things, such as latest I phone etc.
Life is actually a journey, of a single person with no one's company. It's bitter truth that one day your parents will leave you alone here, and after some years your children's will also leave you alone. To be more advanced than you, to explore more possibilities of life which is sometimes we call evolution and then few years later, your better half (if your are in relationship) will leave you to fight alone till your last destiny i.e death.