There are currently less than 4000 tigers left in the wild, which is an insanely small number, given that there are currently more captive tigers in the united states alone than there are in the wild (that's another issue on its own). The tiger is at the top of the food chain, it acts as a regulator for the populations of all the other animals which share the same habitats. If the tiger were to disappear, this would mean a collapse of the ecosystem. 
The main threat tigers are facing is poaching. This should be a problem that can be solved but the laws aren't being enforced firmly enough. What needs to be done is for the Indian government to have more in place to protect tigers, such as harsher laws to scare poachers, and to enforce the laws more firmly. There should also be more individuals who's job it is to monitor the areas where the tigers live to ensure there are no poachers. An increase in the amount of jail time that poachers would face may be enough to scare some away but if there's nobody to monitor whether the laws are being broken it wont make much of a difference. This applies not only to India, but anywhere that is inhabited by tigers, such as Russia. There are efforts being put forth by organizations to help their populations grow, but there can always be more to make thing even better. We can also help them by stopping deforestation and allowing their habitats to be as large as possible and unsegmented to allow them to roam as freely as possible.
I chose to make this campaign because the tiger is my favorite animal, as well as many other people's favorite animal, and I find it sad that we have allowed this creature to be pushed so close to extinction.