Sensex, Nifty drop as crude hits $91 on Iran-US tensions

Imagine a big shop where people buy and sell pieces of companies, called stocks.

The Sensex and Nifty are like scoreboards that show how those stocks are doing in India.

On Tuesday, the scoreboards went down.

One reason is that oil, which is used to make fuel, became more expensive.

Oil prices went above $91 for a barrel.

This happened because the United States and Iran are having a disagreement, and people worry that oil supplies could be disrupted.

When oil gets expensive, companies have to pay more to run their businesses, so investors feel worried.

Also, money from foreign investors became less attractive because interest rates in the US went up.

Some experts think India's economy is strong and companies will earn more money soon, which could help.

But for now, the markets are moving up and down because of these worries.