Sensex Sinks 493 Points, Nifty Ends Below 24,200

A stock market is a place where people buy and sell small pieces of companies, called shares.

On Tuesday, India's big stock markets went down again.

In fact, one of the main market measures, the Nifty, lost value for the sixth day in a row.

The main reason is that oil has become very expensive, costing about 91 dollars for one barrel.

India buys most of its oil from other countries, so expensive oil can make everyday prices go up.

There is also worry because the United States and Iran are having a disagreement, and the peace break between them ended.

When people get worried, many of them sell their shares, which makes prices fall even more.

Computer software companies were hurt the most, while some banks did a little better.

Many people watch these markets because what happens there can affect jobs, prices, and the economy.

Experts say prices could fall a bit more, but India's economy is still thought to be strong underneath.