Paytm is an online shopping app which kets you transfer money from your acccount to your wallet and then you can pay it to someone else which can add that which which you added in his\her wallet to his bank account.
But minimum ammount that can be added is 100rs.
The app gained its popularity during the time of demonetization.
From an overall aspect e-money is a good concept.
And paytm is the best in INDIA.
Its was founded in India only.
Ceo is also indian .
Also it provides you some shopping offers and vouchers and coupons on movies.
Talking about its size its quite small 17.76 mb.
Can be used for pauing bills, online shopping, movie tickets and many more.
Sometimes due to high traffic your payment is nlt completed, then you have to wait for 24 hours or more , that the the process may be completed, or money come back to your wallet.
I hope this was useful to readers.