Cryptocurreny is digital currency and its not in physical form. It can be increased by mining from various crypto sites like bitco.in . In india it is not directly available it can be earned via zebpay then it is transferred to block chain wallet and from there in unocoin wallet.
Bitcoin is a crypto currency and can be converted to any currency. In india 1 BTC is equal to 712241.20 indian rupee. Zebpay is largest crypto currency exchange portal.
There are various crpto currency such as Ethereum( ETH) , Lite Coin ( LTC) , Ripple( XRP) etc.
One thing I must say that investing at crypto currency or purchasing it might be little risky.As some hacking is also reported recently. More over buying and selling of crypto currency nowdays can make you loose whole of your money.
Tips-
1.watch out for scams. There are scams in crpto world that I had already told you anything that isnt buying a coin with a good reputation is a big risk.
2.Traders dealing in crypto uses bots.There are bots designed to take poorly programme bots out.
3.join some social media group that discuss crypto that will keep in touch with you and you would be aware of scenerio.
Remember these points while buing / selling.
Thanku