Skanda Shasti is a festival dedicated to Lord Muruga, the son of Lord Shiva and Parvati. Muruga is known by many other names also– Kumaran, Kartikeyan, Arumughan, Skanda, etc.
The Tamil month of Purattasi is very important for the worship of Lord Vishnu. The four Saturdays in Purattasi are believed to be especially significant.