What is FRIENDSHIP?

I met with my friend today.I am long time no meet with her and even sms with her.During this holiday,i face so many problem.Although we are old friend,we don't communicate with each other for a period of time.Now i believe studying at different place would make our relationship become far away from each other. I really hope we could be friend forever because FRIENDSHIP during primary and secondary school is the most valuable relationship for me.