What is a Stock? And Why Should You Care?

Your colleague made ₹2 lakh on Tata Motors. Your cousin lost ₹80,000 on a “sure shot tip.” Your dad thinks the stock market is gambling. Your uncle has been buying Reliance since 2005 and won’t let anyone forget it.

Everyone has an opinion about stocks. But very few people actually understand what they’re buying when they “buy a stock.”

If you’ve read the beginner investing guide, you know mutual funds are the simplest way to invest. But mutual funds invest in stocks. So before we get into mutual funds, you should know what a stock actually is. Not so you can start trading tomorrow, but so you understand what your money is doing when it’s inside a mutual fund.

You’re buying a piece of a company

That’s it. A stock (also called a share or equity) is a small piece of ownership in a company.

When Infosys lists itself on the stock exchange, it divides its total ownership into crores of tiny pieces. Each piece is one share. When you buy 10 shares of Infosys, you own a very, very small part of Infosys. You’re a part-owner. Not a customer, not a lender. An owner.

What does ownership get you?

• A share of growth. If Infosys grows and becomes more valuable, your shares become more valuable too. You can sell them for more than you paid.
• A share of profits. If Infosys makes money and decides to distribute some of it, you get a small cut. This is called a dividend.
• Voting rights. Technically, you get to vote on company decisions at shareholder meetings. With 10 shares out of crores, your vote doesn’t change anything. But it exists.

Why do companies sell shares?

Companies need money to grow. They can borrow it (bank loans) or they can sell a piece of the company. When a company sells shares to the public for the first time, it’s called an IPO (Initial Public Offering). The IPO money goes to the company. After that, shares trade between buyers and sellers on the stock exchange. The company doesn’t get any money from those trades.

Think of it like a flat. The builder sells you the flat (IPO). If you later sell that flat to someone else, the builder doesn’t get anything. The price depends on what the buyer is willing to pay.

Where do stocks trade?

India has two major stock exchanges:

• BSE (Bombay Stock Exchange) - the older one, established in 1875
• NSE (National Stock Exchange) - the newer one, launched in 1992, where most trading happens today

You can’t just walk into BSE or NSE and buy shares. You need a demat account and a trading account with a broker. Zerodha, Groww, Angel One, ICICI Direct, HDFC Securities are all brokers. Opening an account takes 15-20 minutes online. You’ll need your PAN, Aadhaar, and a bank account.

Your demat account holds your shares electronically (like a bank account holds money). Your trading account lets you place buy and sell orders.

What are Sensex and Nifty?

You hear these on every news channel. “Sensex crashes 800 points!” “Nifty hits all-time high!”

They’re just scoreboards.

These companies are picked based on size, trading volume, and other criteria. TCS, Reliance, HDFC Bank, Infosys, ITC, they’re all in there. If most of these 50 companies’ stock prices go up, Nifty goes up. If most go down, Nifty goes down.

These indexes are weighted, not equal. A giant like Reliance or HDFC Bank has a much bigger impact on Nifty than a smaller company. So when you see “Nifty crashes 500 points,” it often means a few heavyweight stocks dragged it down, not that every company fell.

Sensex and Nifty don’t tell you how every stock performed. They tell you the general direction. A stock like Zomato could crash 10% on a day when Nifty hits a record high. The index is an average, not a guarantee.

Want to know how indices are actually built, what “free-float market cap” means, and why only certain companies make the cut? Read What is a Stock Market Index?.

Why do stock prices go up and down?

This is where it gets interesting. A stock’s price moves based on one thing: how much someone is willing to pay for it right now.

But what drives that willingness? Business performance, future expectations, and human behavior. Let’s break it down:

Company performance. If TCS reports strong quarterly profits, more people want to buy TCS shares. More buyers, price goes up. If they report losses or lose a big contract, people sell. More sellers, price goes down.

Future expectations. Stocks are priced on what investors think will happen, not just what happened. If people believe Reliance’s Jio will dominate telecom for the next decade, the stock price reflects that optimism today. If that belief changes, the price drops even if nothing happened yet.

Industry trends. When the government announced the PLI scheme for electronics manufacturing, stocks of companies like Dixon Technologies jumped. One policy announcement changed expectations for an entire sector.

Interest rates and inflation. When RBI raises interest rates, borrowing becomes expensive for companies. Growth slows. Stock prices tend to fall. When rates drop, the opposite happens.

Global events. COVID crashed Indian markets by 40% in March 2020. A war, an oil price spike, a US recession, they all affect Indian stocks because the economy is connected globally.

Sentiment and panic. Sometimes stocks move because other people are moving them. If everyone is selling, fear takes over and more people sell. This is how crashes happen. The reverse creates bubbles where prices go far beyond what the company is actually worth.

How do people make money in stocks?

Two ways:

1. Capital gains (buy low, sell high)

You buy 100 shares of HDFC Bank at ₹1,500 each. Total investment: ₹1,50,000. Two years later, the price is ₹2,000. You sell. You get ₹2,00,000. Your profit: ₹50,000.

That’s a capital gain. Taxes apply on profits depending on how long you held the stock. Short-term and long-term gains are taxed differently. We’ll cover this in detail in the tax basics guide.

2. Dividends

Some companies pay a portion of their profits to shareholders. ITC, for example, is known for regular dividends. If ITC declares a ₹6 dividend per share and you own 500 shares, you get ₹3,000. Dividends are added to your income and taxed at your income tax slab rate.

Most people focus on capital gains because that’s where the big money is. Dividends are more like a bonus.

How do people lose money in stocks?

The same way, just in reverse.

You buy 100 shares of Yes Bank at ₹300 each in 2018. Total: ₹30,000. By 2020, the stock is at ₹12. Your ₹30,000 is now worth ₹1,200. A 96% loss.

This actually happened. Thousands of retail investors lost money on Yes Bank.

Common ways people lose:

So should you buy stocks?

If you’re just starting your investing journey, probably not yet.

Individual stock picking needs research, patience, and the ability to watch your portfolio drop 30% without panicking. Most professional fund managers, people who do this full-time with teams of analysts, fail to beat the Nifty 50 index consistently. What chance does someone checking stocks between meetings have?

That’s where mutual funds come in. A mutual fund takes money from thousands of investors and a professional fund manager picks stocks (or bonds) for you. You get exposure to 50-100 stocks through a single investment. If one stock crashes, it’s a small portion of the fund. The diversification protects you.

When a mutual fund factsheet says “equity fund” or “large-cap fund,” it means the fund manager is buying stocks of large companies. Now you know what that means.

The bottom line

For most salaried Indians, the smart path is: understand what stocks are (you just did that), then invest through mutual funds where a professional picks stocks for you and diversification limits your risk.

Next up: Mutual Fund Basics, where we cover how mutual funds actually work, the different types, and how to pick your first one.