How does Stock and Stock Market work?

Hmm…this is a million dollar question I guess. I have seen many fundoo people who know almost everything about everything. But when it comes to stock market…tie tie fiss!! (as in hindi)

Even I was keen on how it works especially with the BSE making such a roar all over India crossing 17k and stuff!! So what is this 17k? How do they reach this figure? Follow the links in order:

http://money.howstuffworks.com/stock.htm

http://www.indiahowto.com/how-to-calculate-bse-sensex.html