1. Friendship is an emotion from a two-way relationship, that is, the feelings of both sides must be maintained together. Any unilateral goodwill or deviation cannot be called friendship.

2. Friendship takes intimacy as its core component, and intimacy is also called an important indicator to measure the degree of friendship. Even if the friendship fades after a certain degree of intimacy, this beautiful memory will be treasured in the "eternal" memory, which will be unforgettable for life, and can be recovered from nostalgia when we meet again. This emotion can be called "eternal" friendship.

The essence of friendship is an emotional spiritual need and dependence of two people with the same topic, interest, hobby and ambition.