Thaipusam is a Hindu festival celebrated mostly by the Tamil community on the full moon in the Tamil month of Thai (January/February).
he word Thaipusam is a combination of the name of the month, Thai, and the name of a star, Pusam. This particular star is at its highest point during the festival. The festival commemorates the occasion when Parvati gave Murugan a Vel "spear" so he could vanquish the evil demon Soorapadman. It is commonly believed that Thaipusam marks Murugan's birthday; Some other sources suggest that Vaikhasi Vishakam, which falls in the Vaikhasi month (May/June), is Murugan's birthday.