eBay is the dominant online auction and shopping platform. It has a global reach with over 100 million registered users worldwide. While it faces competition from Amazon, Yahoo Auctions, and others, eBay remains the leader in the online auction space due to its large customer base, brand recognition, and variety of goods available on its platform. However, eBay also faces challenges such as fraudulent activities, system breakdowns, and attracting more buyers relative to sellers. Overall, eBay has a strong market position but will need to address problems and adapt to changing market conditions to maintain its leadership role.