What is Friendship?

I want to find out the answer to the question---

What is friendship?

When it rains, I feel friendship is a small umbrella.

It can give me a piece of clear sky.

When I'm crying, I feel friendship is a white handkerchief.

It can wipe the tears' stains dry.

When I am sad, I feel friendship is some warm words.

It can bring me happiness again.

When I am in trouble, I feel friendship is a strong hand.

It can help me to escape my troubles.

When I sit in a quiet place, I feel friendship is a very wonderful feeling.

It can't be pulled and torn, because it is in everyone's heart.

It is here from the beginning to the end of our lives.

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