1) the world's first global payment network, like email, and
2) the world's first global digital currency
People buy bitcoins to:
1) use it to make payments to friends, family and merchants, and
2) as an investment
Know what is bitcoin in 2 minutes:
For a longer explanation, watch this video by one of Zebpay's founders :)
Still not had enough, then go through our shortlisted videos to learn even more!