Skandamata Devi is the fifth aspect of the Hindu goddess Durga and is the fifth Navadurga. Her name Skandamata indicates 

Skanda means Lord Kartikeya 

Mata means mother

Hence Skandamata means mother of Lord Kartikeya. 

This means that Maa Skandamata is the mother form of Goddess Durga and she is very kind and caring.

Maa Skandamata is worshipped as the mother of supremely talented child called Kartikeya. When a devotee workship Maa Skandamata then automatically Lord Kartikeya is worshipped as he is sitting on his mother's lap. Her worshipped leads to peace, power, prosperity  and salvation. She is regularly known as "The Goddess of Fire".

Goddess Kushmanda has four arms. Her one hand is always in blessing posture, two hands hold the lotus flowers and the fourth hand carries Lord Kartikeya in her lap. She rides on a lion. Lord Kartikeya is considered to be very intelligent and he is the commander-in-chief of the army of the Lords. Lord Kartikeya is known as Lord Murugan in Southern part of India.