Ganesha (गणेश) also known as Ganapati (गणपति) is one of the widely worshipped deities in Hindu religion. He is son of Lord Shiva and Goddess Parvati.
His original name although was Vinayaka (विनायक) which was given to him by his mother and the name Ganesha was given to him by Lord Shiva. The word Ganesha is made up of Gana which means followers of Shiva and Isha which means Lord. Thus by giving this name Lord Shiva appointed his son as Lord of all Ganas.
Ganesha’s elephant head makes him particularly easy to identify. He also has a curved trunk and big ears, and a huge pot-bellied body of a human being.
Because of his elephant head he is also known as Gajanana (गजानन) which means Elephant Faced Lord.
Ganesha is widely revered as the Remover of Obstacles and God of wisdom and intellect. Hence he is also known as Vighnaharta (विघ्नहर्ता) which means Demolisher of Obstacles or Vighnavinashaka (विघ्नविनाशक) which means Destroyer of All Obstacles & Impediments, Vigneshwara (विघ्नेश्वर) which means Lord of All Obstacles, Vidyavaridhi (विद्यावारिधि) which means God of Wisdom and Buddhividhata (बुद्धिविधता) which means God of Knowledge.
Lord Ganesha is also considered as Bestower of Success hence he is also known as Siddhivinayak (सिद्धिविनायक).
Lord Ganesha is always worshipped before any auspicious work is begun. it is believed that Lord Ganesha received a boon from his father Lord Shiva that anyone who worships him at the beginning of anything new will not face any obstacles in it.
Apart from that, Lord Ganesha is one of the five prime Hindu deities whose idolatry is glorified as the panchayatana puja, other four being Brahma, Vishnu, Shiva and Durga.