What is the stock market — really?
Most people have a vague sense of what the stock market is. Very few understand what actually happens when it moves. Let's fix that.
Key takeaways
Let's start somewhere unusual. When you buy a share of Reliance Industries, you are not buying a number. You are buying a tiny piece of ownership in one of India's largest companies — its refineries, its Jio towers, its retail stores. That ownership is real. If Reliance makes more profit next year, your share of that profit increases. If they build something new that the market gets excited about, your ownership becomes more valuable. A stock is not a casino chip. It is a claim on a real business.
So what is a stock exchange?
Think of a stock exchange as a very organised marketplace — like a sabzi mandi, but for company ownership. Instead of tomatoes, people buy and sell shares. The National Stock Exchange (NSE) and the Bombay Stock Exchange (BSE) are India's two major exchanges. NSE handles the larger volume — about 90% of all equity trading in India happens there. Both are regulated by SEBI, which sets the rules for how trading happens, what companies must disclose, and how investors are protected.
Why do stock prices move at all?
This is the part most people get wrong. Stock prices don't just go up when companies make money. They go up when companies do better than people expected. And they fall when companies disappoint — even if they're still profitable. The market is constantly pricing in future expectations. When Infosys reports 18% revenue growth but analysts expected 22%, the stock can fall even though the company grew. The market is always comparing reality to what was already 'priced in'. This is why stock markets can seem irrational — they're not measuring what happened, they're measuring the gap between what happened and what was expected.
India's markets vs the world
India has two main indices: the Nifty 50 (NSE) and the Sensex (BSE). Both track the largest companies by market cap. In the US, you have the S&P 500 — which tracks the 500 largest American companies — and the Nasdaq, which is heavily weighted toward technology. The Dow Jones is the oldest index, tracking just 30 large American companies. When people say 'global markets are down', they usually mean the S&P 500 moved. Because the US market is so large — roughly $45 trillion in total market cap versus India's roughly $4 trillion — what happens in America ripples into India within hours.
Who actually buys and sells all day?
Three types of participants drive most of the volume. Retail investors — people like you and me, investing through apps like Groww or Zerodha. Domestic Institutional Investors (DIIs) — mutual funds, insurance companies, pension funds — investing on behalf of crores of Indian savers. And Foreign Institutional Investors (FIIs) — large global funds from the US, Europe, Singapore — who move in and out of India based on global interest rates, dollar strength, and their view on emerging markets. On days when FIIs are selling heavily, even fundamentally strong stocks can fall 3–5% for no company-specific reason.
Why you probably don't need to understand all of this to invest
Here's the honest truth: nobody — not fund managers, not analysts, not traders — consistently predicts short-term market movements. The market is too complex, too global, and too driven by human emotion to forecast reliably. What you can do is own a diversified slice of the entire market through an index fund, ignore the daily noise, and let the long-term growth of the Indian economy do the work for you. The Nifty 50 has returned roughly 12–13% CAGR over the last 20 years despite wars, pandemics, recessions, and countless 'this time it's different' moments. Staying invested through all of it was the only strategy that consistently worked.