According to the Oxford English Dictionary, originally Hindutva is the state or quality of being Hindu; ‘Hinduness’. In later use, it defines Hindutva as an ideology seeking to establish the hegemony of Hindus and the Hindu way of life. According to the Encyclopædia Britannica, “Hindutva (‘Hindu-ness’), [is] an ideology that sought to define Indian culture in terms of Hindu values”.
In a 1995 judgment, the Supreme Court of India ruled that “Ordinarily, Hindutva is understood as a way of life or a state of mind and is not to be equated with or understood as religious Hindu fundamentalism … it is a fallacy and an error of law to proceed on the assumption … that the use of words Hindutva or Hinduism per se depicts an attitude hostile to all persons practising any religion other than the Hindu religion … It may well be that these words are used in a speech to promote secularism or to emphasise the way of life of the Indian people and the Indian culture or ethos, or to criticise the policy of any political party as discriminatory or intolerant.”
According to Vinayak Damodar Savarkar, Hindutva is an inclusive term of everything Indic. He said:
HINDUTVA IS NOT A WORD BUT A HISTORY. NOT ONLY THE SPIRITUAL OR RELIGIOUS HISTORY OF OUR PEOPLE AS AT TIMES IT IS MISTAKEN TO BE BY BEING CONFOUNDED WITH THE OTHER COGNATE TERM HINDUISM, BUT A HISTORY IN FULL. HINDUISM IS ONLY A DERIVATIVE, A FRACTION, A PART OF HINDUTVA. … HINDUTVA EMBRACES ALL THE DEPARTMENTS OF THOUGHT AND ACTIVITY OF THE WHOLE BEING OF OUR HINDU RACE. SOURCE: WIKI
Appropriating national symbols and infusing in them a Hindu content has long been a strategy of the BJP and the RSS.
In short, Hindutva is a virulently hateful ideology which survives by instilling false grievances amongst the Hindu population against Muslims and other minorities and then nurturing that anger to incite communal riots with the ultimate purpose of cleansing India of non-Hindus  . They distort history and invent history to achieve that goal.
Hindutva is a nationalist ideology, based on a modern day version of centralized intolerant Hinduism. It has nothing to do with a historical tradition of spiritual practices that we call Hinduism. Such a centralized and chauvinistic Hinduism – Hindutva – has been brought to the fore front in today by a group of political organizations called the “Sangh Parivar ” (Sangh Family) – consisting of the Rashtriya Swayamsevak Sangh (National Volunteers Association – the mother organization after which the label Sangh Parivar is coined), the Bharatiya Janata Party (Indian People Party – Hindutva’s constitutional front that fights elections etc.), the Vishwa Hindu Parishad (VHP – World Hindu Council – the formations activist front), the Shiv Sena (the fascist front), the VHP of America (Hindutva’s overseas arm) and the Hindu Students Councils (VHP of America’s student wing). – An anti-Indian Nationalist Ideology.
A Report on Nonprofit Groups @ http://sacw.net/
“India-based Sangh affiliates receive social and financial support from its U.S.-based wings, the latter of which exist largely as tax-exempt non-profit organizations in the United States: Hindu Swayamsevak Sangh (HSS), Vishwa Hindu Parishad of America (VHPA), Sewa International USA, Ekal Vidyalaya Foundation-USA. The Overseas Friends of the Bharatiya Janata Party – USA (OFBJP) is active as well, though it is not a tax-exempt group.”