A sign-up bonus refers to an offer that casino gives to new customers once they sign up on their site. Casinos use these bonuses to attract new customers and provide them with some funds to start betting. Sign-up bonuses are not withdraw-able and should be used within a timelimit, depending on the casino.
India is the country that has the world's second largest population. This means that it is a place that online casino operators are very keen to get involved in. The potential size of the market means that there are huge rewards for anyone who is able to set up a popular online casino in India.