A stock is simply a share of ownership in a company. When you buy a company's stock, you become a part-owner of that business. Think of it like a pizza. If a company is a whole pizza, owning one stock is like owning a single slice. The more slices you have, the more of the pizza you own.

Why do companies sell these slices? They issue stock to raise money. This cash, called capital, helps them grow, whether that means building new factories, hiring more employees, or developing new products. For investors, buying stock is a way to potentially grow their own money. If the company does well, the value of its stock may increase, and your slice of ownership becomes more valuable.

You can't buy stock directly from a big company's headquarters. Instead, these transactions happen in a specialized marketplace called a stock exchange. Exchanges are organized markets where buyers and sellers come together to trade stocks in a fair and orderly way. The most famous example in the United States is the New York Stock Exchange (NYSE).

But individual investors don't trade directly on the exchange floor. To participate, you need a go-between, known as a stockbroker. A broker is a licensed professional or firm that executes buy and sell orders on behalf of investors. In the past, this meant calling a person on the phone. Today, it's usually done through an online brokerage platform or a trading app on your phone.

At any given moment, a stock has two key prices: the bid and the ask. The bid price is the highest price a buyer is currently willing to pay for a stock. The ask price is the lowest price a seller is willing to accept for that same stock. A trade happens when a buyer and seller agree on a price.

Let's walk through a simple trade. Suppose you want to buy one share of a company called 'TechCorp'. You log into your brokerage account and see:

• Bid Price: $100.00
• Ask Price: $100.01

This means someone is willing to buy TechCorp for $100.00, and someone else is willing to sell it for $100.01. If you want to buy the stock immediately, you'll likely place a market order. Your broker will execute the trade at the best available ask price, which is $100.01. Your order is matched with a seller, and just like that, you own a share of TechCorp. The entire process is now electronic and takes just a fraction of a second.

Now that you have the basic building blocks, it's time to check your understanding.

Understanding these core concepts is the first step toward navigating the stock market with confidence.