Lord Ganesh is a widely worshiped Hindu deity with a elephant head and human body. He is the God of Intellect (Buddhi), Learning and Wisdom. Lord Ganesh is the remover of all obstacles. So, before beginning of any good activity, project or puja, Lord Ganesh is the first diety to be remembered.
Lord Ganesh is the son of Lord Shiva and Devi Parvati and his brother Lord Kartikeya. He has 2 wives Riddhi and Siddhi and his daughter is Devi Santoshi Ma. Lord Ganesh’s vehicle (vahana) is a tiny mouse.
His name Ganesh (Gana + Esh) means that he is the leader of Ganas. Ganas refers to the Shiv Ganas who are the divine beings who are eternally serving Lord Shiva. He is also popularly known by various other names praising his form or qualities like Ganesha, Ganapati, Vinayaka (Lord of Knowledge) , Vighneshvara ( Remover of all obstacles) , Vakratunda (God with Curved Trunk), Lambodara (Lord with big stomach), Ekadanta (Lord with single tusk), Siddhivinayaka (Lord of Success and Power) etc. There are more than 1000 names of Lord Ganesh which you can find in Ganesha Sahasranama Stotra. Daily Chanting of these names provides great spiritual and material benefits.
Lord Ganesh appears in a human body with a huge belly and a elephant head with large ears and a broken tusk. He has four arms with each arm holding a different objects : one arm holds a lotus or a rope, second arm holds an axe or some other weapon, the third is holding a sweet (laddoo) or his favorite Modak and the fourth arm is for blessing his devotees. His mouse is usually found near his feet.
Lord Ganesh is the most revered deity in the Hindu spiritual scriptures and Puranas. Ganapati Atharvashirsa asserts that Lord Ganesh is the personification of the Holy sound, Om (Aum). He is AumKar Swaroop. Hence, all Hindu spiritual Mantras first start with Om because prefixing Om means Lord Ganesh himself removes all obstacles from chanting the mantra and makes the mantra powerful.