An eCommerce website requires several essential elements. First, it needs a user-friendly design, including an intuitive navigation menu and clear, appealing product pages. Second, it needs a secure, reliable shopping cart and checkout system, including multiple payment options to cater to different customer preferences. Third, it needs robust security measures, such as SSL encryption, to protect customer data and transactions. Fourth, it needs a mobile-responsive design to cater to mobile shoppers. Fifth, it needs effective SEO practices to improve visibility on search engines. Sixth, it needs analytics integration to track performance and guide improvements. Lastly, an eCommerce site requires a clear return and shipping policy, contact information, and excellent customer service to build trust with shoppers. Depending on the specific needs of your business, you may also require features like a blog, social media integration, and customer reviews.