Paytm is an Indian e-commerce shopping website launched in 2010, owned by One97 Communications which initially focused on Mobile and DTH Recharging. I have been using paytm for the past few months now and it was an amazing experience as it makes recharges very easier as we dont need to go to shops to make recharges for mobile, DTH, Bills etc.
Some of the online shopping sites also supports paytm, so if you have paytm amount you can use it for online shopping as well. I am recharging especially mobiles using paytm.