The Ashok Chakra is a symbol that denotes the strong connection between India and Buddhism. This is considered as another version of the Dharma chakra, propagated by the Buddhists. It is known by this name, because it was first used by Asoka on one of his pillars located at the Lion Capital of Sarnath.
One of the most common and most noticeable places where the Ashok Chakra is being used extensively today is on the National Flag. During the times prior to getting Independence, the symbol that was present in the middle of the Flag was the Spinning Wheel, also known as the Charkha. However, on July 22nd 1947, the Ashok Chakra officially became the symbol on the Flag. The colour chosen for this was navy blue and it was fixed against the backdrop of white, thereby making it quite prominent.
The Ashok Chakra replaced the Spinning Wheel symbol in a bid to differentiate the National Flag and the Flag of the Indian National Congress Party and to add more meaning and value to the flag. This has 24 spokes and found right at the centre of the flag.