People greet each other once the moulvi announces the sighting of new moon. Various greetings are commonly used to greet once Ramadan begins. The most frequently used greetings among people are Ramadan Mubarak, Ramadan Kareem and Happy Ramadan. Ramadan Mubarak means âBlessed Ramadanâ, whereas Ramadan Kareem means âGenerous Ramadanâ.