Kartik Puja falls on the last day of the bengali month Kartik in the middle of November. Kartik, called Skanda in the sacred text of the Veda, or also Muruga, Subramanya, Velan, Kumara and Shanmukha is the Deva of the war. The name Skanda means the gushing as the tradition wants it conceived by the only seed that the father Rudra Shiva threw himself into the fire and poured them into the Ganges.
In the transition from Vedic god god of the Purana tradition wants second son of Shiva and Parvati and brother of Ganesa, designed to kill the Daityas or demon Tarakasura also called Taraka. It owes its name to the fact that it was developed by the Krittika.
Karttikeya is usually depicted with six heads, and sometimes twelve arms in honor of Krittika, armed with a spear, wears the crown of the major gods and his vehicle is the peacock or Paravani or a peacock. Karttikeya is that aspect of God that protects the spiritual growth of the aspirants. His cult was forbidden to women and was also the patron of thieves.
Another name that is known is Kumara literally strong guy that in the Puranas dedicated to Vishnu is the son of the fire god Agni and the nymph Sara. This deity is resulting from the merger of different divine persons, ie Indra Vedic, of Surya, as well as Śiva.