A stock ticker is a system that displays the current prices and trading volumes of publicly traded companies. It provides real-time updates on stock performance, allowing investors to track their investments and make informed decisions. Each stock is represented by a unique combination of letters, known as a ticker symbol, which helps identify the company on the stock market. Stock tickers are commonly found on financial news websites, television channels, and trading platforms. They often scroll across the screen, showing the latest market data. Investors use this information to monitor trends and fluctuations in the stock prices of companies like Apple, Tesla, or Amazon.