India is a diverse country with a multitude of languages and cultures, each with their own traditional forms of greeting. However, there are a few common greetings that are widely used and recognised:
Indian women traditionally shake hands with foreign women but not with men, although this practice may vary among educated and contemporary Indian women. Western women can feel comfortable shaking hands with Indian women or Western-oriented Indian men, but they may want to avoid this gesture with traditional Indian men. English is widely spoken in India, especially in urban areas and among the younger and educated populations. So, "Hello," "Hi, How Are You?" are also commonly used.
Always consider the cultural context and the person you're speaking to when choosing a greeting. A sincere and respectful approach is usually well received.