An e-commerce website is designed to facilitate online transactions between a business and its customers. Here are some key features that an e-commerce website should have:

1. Product pages: E-commerce websites should have individual pages for each product, including product descriptions, pricing, and images. Customers should be able to browse through products and filter them by category, price, and other parameters.
2. Shopping cart: E-commerce websites should have a shopping cart feature that allows customers to add products to their cart and continue shopping. The cart should show the total cost of the order, including taxes and shipping costs.
3. Payment gateway: E-commerce websites should have a secure payment gateway that allows customers to pay for their orders online. This should include support for popular payment methods, such as credit cards, PayPal, and online banking.
4. Order management: E-commerce websites should have a backend system that allows the business to manage orders, process payments, and update product inventory.
5. User accounts: E-commerce websites should allow customers to create user accounts, which can save their preferences and order history, and make it easier to checkout on future orders.
6. Shipping and tracking: E-commerce websites should provide customers with shipping options and tracking information for their orders.
7. Security: E-commerce websites should be designed with strong security features to protect customer data and financial information. This should include SSL encryption, firewalls, and other security protocols.
8. Mobile responsiveness: E-commerce websites should be optimized for mobile devices, allowing customers to browse and order products on their smartphones and tablets.

By incorporating these key features into an e-commerce website, businesses can create a professional and user-friendly online store that can attract customers and drive sales.