If you're interested in buying silver in India, the simplest way is to buy it in physical form i.e. bars and coins.
You can buy these from a jewellery store. Always go to a reputed and government approved jeweller.
Be sure to test the silver for purity. A reputed jeweller will offer electronic testing. For a nominal cost you can be assured of the purity. Get your silver tested, certified, and hallmarked.
Hallmarked bullion is one which has the stamp, the weightage, the purity, and the logo of the seller. It's like an undertaking which certifies the purity, weights, measures etc. Insist on it.
Also, insist on buying officially, i.e. always with a receipt.
You also have the option of buying physical silver from MMTC and ecommerce sites. But we would discourage that. The prices quoted here will be higher than what you will find at a local jewellery store.
When buying in physical form, the responsibility of storage and security is yours.
You can also buy silver via ETFs.
Read all about how to invest in silver.
We also suggest watching this video - Do Not Buy Silver Before You Watch This Video.