If the tigers go extinct, the entire system would collapse.For e.g. when the Dodos went extinct in Mauritius, one species of Acacia tree stopped regenerating completely. So when a species goes extinct, it leaves behind a scar, which affects the entire ecosystem. Another reason why we need to save the tiger is that our forests are water catchment areas. 

Therefore, it’s not just about saving a beautiful animal. It is about making sure that we live a little longer as the forests are known to provide ecological services like clean air, water, pollination, temperature regulation etc.
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Kuan Bola mein nahi Bola per app kuanki tiger wild animal hai per tiger ki raksha karo tikhe
Tigers are extinct and it is national animal of India if we don't have any tiger left then we will suffer that there is no tigers left so India is making santuries for tiger to live.