The fourth day (Chaturthi) of Shukla Paksha of Bhadrapada Vedic month is celebrated as Ganesh Chaturthi, Siddhi Vinayaka Chaturthi, and Ganesha Chauth (more or less in some parts) in India.
Ganesha Purana and Skanda Purana mention the birth of Sri Ganesha on Shukla Chaturthi of Bhadrapada(which is today). On this day, people bring in or make Shree Ganpati at their homes and worship till the day of Visarjan. Shree Ganpati is made using organic and eco-friendly materials like flour, turmeric, and clay.
Shree Ganpati is invoked and worshipped before beginning any new project, rituals, and pooja because He can remove any obstacles and thus also known as Vigneshwara. Vedic history and scriptures also tell us that it was Sri Ganpati who wrote the epic Mahabharata as described by Rishi Ved Vyasa.
A lot of people question me-But why does He have an elephant head?
Shree Ganesh is also known as Ganapati meaning Lord of Ganas. It is not Gajapati (Lord of elephants). It is Ganapati. You can read more about it here: https://isha.sadhguru.org/…/wisdom/article/shiva-ganas…
Happy Ganesh Chaturthi!
Srishti Moudgil 
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