Generally by a sister is meant a female person who has the same parents as another person,one's sibling. One who has a sister is a very lucky person. Sisters are most dear, most beloved individual. An elder sister is a guidance to one's life being the friend and philosopher,who always keeps in mind the concern of the younger sibling,gives a motherly care and of course a dear asset. A younger sister is like a little angel who brings a special charm to one's life.
In most societies throughout the world, siblings usually grow up together and spend a good deal of their childhood with each other. Specially when they are close in age a friendly bonding develops in them. The sibling bond is often complicated and is influenced by factors such as parental treatment,birth order,personality,and people and experiences outside the family.
Rivalry rather feeling of ill will arousing active hostility is a very common thing among siblings. They love each other but it is not very uncommon to argue and fight over pretty things. It is often seen that two children while playing start quarreling and fighting for toys and all. They start out fighting for trivial things like chocolates and gifts which at that time seem to them as the most important thing in the world. But they forget the fighting again get mixed with each other and start playing. Older brothers or sisters often bully and boss over the younger ones but it is also seen that they love their younger siblings like anything. They protect their younger brother and sister from all dangers and also from parents' scoldings. This brother sister relation is a blend of love and some sweet fights.
The celebration of sister's day is a honour to this sweet relationship. It gives another chance to every individual to express their love for their sister by adoring them with some gifts and endowments.