Raksha Bandhan, (the bond of protection) or Rakhi, is a festival primarily observed in India, which celebrates the relationship between brothers and sisters. It is also called Rakhi Purnima in most of India. It is also celeberated in some parts of Pakistan.  The festival is observed by Hindus, Sikhs and some muslims. The central ceremony involves the tying of a rakhi (sacred thread) by a sister on her brother’s wrist. This symbolizes the sister’s love and prayers for her brother’s well-being, and the brother’s lifelong vow to protect her.
The festival falls on the full moon day (Shravan Poornima) of the Shravan month of the Hindu lunisolar calendar. It grew in popularity after Rani Karnavati, the widowed queen of Chittor, sent a rakhi to the Mughal emperor Humayun when she required his help.  The festival is marked by the tying of a rakhi, or holy thread, which comes in many colors and designs, by the sister on the wrist of her brother. The brother in return offers a gift to his sister and vows to look after her as she presents sweets to him.
The brother usually presents his sister with an envelope filled with money however, other presents such as saris and clothing can be given. The brother and sister traditionally feed one another sweets. These sweets include anything from Jalebi, Kaju Katli, and Burfi. Since north Indian kinship practices give cousins a status similar to siblings, girls and women often tie the rakhi to their male cousins as well (referred to as “cousin-brothers” in regional parlance) in several communities.
Unrelated boys and men who are considered to be brothers (munh-bola bhai or adopted brothers) can be tied rakhis, provided they commit to a lifelong obligation to provide protection to the woman or girl.  The chaste bond of love between a brother and a sister is one of the deepest and noblest of human emotions. ‘Raksha Bandhan’ or ‘Rakhi’ is a special occasion to celebrate this emotional bonding by tying a holy thread around the wrist.
This thread, which pulsates with sisterly love and sublime sentiments, is rightly called the ‘Rakhi’. It means ‘a bond of protection’, and Raksha Bandhan signifies that the strong must protect the weak from all that’s evil. The ritual is observed on the full moon day of the Hindu month of Shravan, on which sisters tie the sacred Rakhi string on their brothers’ right wrists, and pray for their long life.
Rakhis are ideally made of silk with gold and silver threads, beautifully crafted embroidered sequins, and studded with emi precious stones. It won’t be wrong to say the fashionable friendship band in vogue today is an extension of the Rakhi custom. When a girl feels a friend of the opposite sex has developed a kind of love too strong for her to reciprocate, she sends the guy a Rakhi and turns the relationship into a sisterly one. This is one way of saying, “let’s just be friends”, without hurting the other person’s soft feelings for her.