The day of full moon, Purnima, in the month of Ashadh is traditionally celebrated as Guru Purnima by Hindus. Also known as 'Vyas Purnima', the day is celebrated in remembrance and veneration to sage Ved Vyas. He is the Adi (original) Guru of the Hindu Dharma, who classified the Vedas, wrote the eighteen Puranas and the Mahabharat. This year it falls on 22 july, 2013.
It is celebrated in the sacred memory of the great sage Vyasa. Sage Vyasa is known to be the Adi (original) Guru of the Hindu religion. Hindus are indebted to him as he edited the Vedas and also wrote 18 Puranas, Srimad Baghvata and the Mahabharata. Dattatreya, who happened to be the Guru of Gurus was taught by Vyasa.
On this day Krishna-dwaipayana Vyasa, who is the author of Mahabharata, was born. Veda Vyasa made several contributions to the Vedic literature.
On this day, the Guru (Teacher, who give you knowledge) is offered Pujan (worship)by the disciples. The devotees seek truth, love and compassion from them. They show undue respect to their knowledge and teachings.
The day of Guru Purnima has great significance for spiritual sadhaks and farmers. All spiritual aspirants and devotees worship Vyasa in honor of his divine personage and all disciples perform 'puja' of their respective spiritual preceptor or 'Gurudevas'. They offer flowers and sweets to their spiritual Gurus.
It is also good time to begin spiritual lessons from a Guru. Traditionally, spiritual seekers commence to intensify their spiritual 'sadhana' from this day. In India, Guru Purnima is celebrated at various ashrams.