What is this concept?

It's their way of marketing their products.Most of them are spams, so be careful when you join in sweepstakes.

I don't concept but i would like ton the ways you earn from home and internet.i am from India.

It's something like a lottery. Most will be scams. Don't waste your time!

It's not worth it, if you want to have a chance to hit the jackpot just buy a sweepstakes or lottery ticket off line in the country where you are from, the odds are greatly against you but at least it helps charity and generate income for your government. I joined one of those when I was new in the internet and it sent me a lot of spam in my email and seems like they sold my email to other scammers and spammers like them

Sweepstakes is like lottery. If you enter you can win some sum of money or item like phone or anything they like to offer as an award. Some internet panels got daily, monthly or quarterly sweepstakes. Is depend of the rule of the panels. I hope that will help.