What Is the Stock Market and How Does It Work? (NSE, BSE, Sensex & Nifty)

The stock market is a marketplace where investors buy and sell shares of listed companies. In India, most share trading takes place through the National Stock Exchange (NSE) and the Bombay Stock Exchange (BSE), while the Nifty 50 and the Sensex track the performance of some of the country's largest listed companies. SEBI regulates the market, and investors' shares are held electronically in demat accounts. 

In this blog, we'll explain what the stock market is, how it works in India, and what NSE, BSE, Sensex and Nifty each do.

#What is the stock market?

The stock market is a marketplace where buyers and sellers come together to trade shares and other securities. India's market regulator, SEBI, defines it as a financial marketplace where investors trade shares and other securities under a common set of rules. In simple terms, it is where companies raise money and where you buy part-ownership of those companies.

When people ask what the share market is, they mean the same thing. "Share market" and "stock market" are two names for one place. A share is a small unit of ownership in a company, and the market is where those shares change hands at prices agreed upon by buyers and sellers.

The wider job of this market is to move savings towards businesses that can put the money to work. Your investment helps a company grow, and in return you get a stake in how it performs.

#Primary market vs secondary market

The stock market has two sides, and knowing the difference tells you where your money actually goes.

The primary market is where a company sells its shares for the first time, usually through an Initial Public Offering, or IPO. Here the money flows straight to the company, which uses it to fund growth. When you apply in an IPO, you are buying directly from the business.

The secondary market is where those shares trade after listing. This is the day-to-day market most people picture, where investors buy and sell from each other. The company does not receive this money; it moves between the buyer and the seller. When you buy a listed share through your broker, you are trading in the secondary market, and what you gain is the ability to sell again whenever you want.

#NSE and BSE: India's two main stock exchanges

A stock exchange is the organised part of the market where trading actually takes place. India has two major exchanges, both of which are electronic and regulated by SEBI.

The BSE, or Bombay Stock Exchange, began in 1875 and is Asia's oldest stock exchange. It lists over 5,000 companies, including many small and mid-sized firms.

The NSE, or National Stock Exchange, was established in 1992 and began trading in 1994. It lists more than 2,700 companies and handles the largest share of the country's daily trading turnover.

For most investors, the choice of exchange barely matters. Large companies trade on both exchanges, and your broker lets you choose the exchange when placing an order. The main difference you will notice is that each exchange has its own headline index: the Sensex belongs to the BSE, and the Nifty belongs to the NSE.

#Sensex and Nifty: reading the market's mood

The Sensex and Nifty are index numbers that track how a set of large companies is doing. When the news says the market rose or fell, it usually means one of these two moved.

The Sensex is the BSE's flagship index. It tracks 30 large, well-established companies and uses a base period of 1978-79, set to 100. Every move in the Sensex measures how that group of 30 companies has changed in value since then.

The Nifty 50 is the NSE's main index. It tracks 50 large companies across the major sectors of the economy, with a base value of 1000 set in November 1995.

Both indices weight companies by their free-float market value, which is the portion of shares available for public trading. This means bigger companies move the index more than smaller ones. A rising index tells you that these large companies, taken together, are worth more than before. What it does not tell you is how every stock is doing, since a handful of big names can pull the number up while smaller shares drift the other way.

#How a trade actually works

Placing a stock market order triggers a short chain of steps that ends with shares landing in your account. Here is what happens when you buy.

1. You place a buy order through your broker's app or website. Your broker is a registered member of the NSE or BSE.
2. The exchange matches your order with a seller who is willing to accept the same price. Once matched, the trade is confirmed.
3. A clearing corporation steps in between the buyer and seller to make sure both sides honour the deal.
4. Upon settlement, the shares are credited to your demat account, and the funds reach the seller.

Under the standard T+1 settlement cycle, a normal equity trade placed on Monday is settled on Tuesday, subject to applicable holidays and settlement rules.

Regular equity trading runs from 9:15 am to 3:30 pm, Monday to Friday, on both the NSE and BSE. There is also a 9:00 am to 9:15 am pre-open session that uses a call-auction mechanism to determine the opening price. The exchanges stay closed on weekends and on declared market holidays.

#Who keeps the stock market safe?

The stock market works on trust, and that trust rests on regulation.

SEBI, the Securities and Exchange Board of India, is the main regulator. It was established as a statutory body in 1992 and is tasked with protecting investors and maintaining a fair, transparent market. SEBI oversees exchanges, brokers, and companies that list their shares, and sets the rules everyone must follow.

The Reserve Bank of India, or RBI, plays a supporting role. As the country's central bank, it manages the banking and payment systems that facilitate settlement. In short, SEBI watches over the securities market, while the RBI looks after the money rails behind it.

For you, as an investor, this framework means your shares sit safely in your demat account with a depository, not with your broker, and that everyone in the chain is accountable to a regulator.

#Conclusion

The stock market is an organised marketplace where investors buy and sell shares of listed companies. The NSE and BSE facilitate this trading, while the Sensex and Nifty provide a quick view of how some of India's largest companies are performing, all within a market regulated by SEBI.

Once you know how orders are placed, matched, settled, and credited to a demat account, following the market becomes much easier. Open a demat account with SMC to start investing in listed shares through India's regulated stock exchanges.

Investments in securities markets are subject to market risks. Read all the related documents carefully before investing.