Requirements of Amazon 

1. Functional Requirements

These are the core features that the system must provide for users to interact with and perform operations on the platform.

• User Registration and Authentication:
  The system must allow new users to register, verify their email or phone number, and securely log in using their credentials. Password management and user profile updates are also part of this module.

• Product Browsing and Search:
  Customers must be able to browse products through categories or use search functionality to find specific items. Filtering and sorting by price, rating, and popularity should be supported.

• Product Management for Sellers:
  Sellers must be able to list products, set prices, manage inventory, update product descriptions, upload images, and view product analytics like views and sales performance.

• Shopping Cart and Wishlist:
  Users can add items to a cart before checkout and save products to a wishlist for later. The cart should maintain state for logged-in users and support updates to quantity and item removal.

• Order Placement and Payment Integration:
  Users should be able to place orders with various payment options such as credit card, debit card, net banking, digital wallets, and cash on delivery. The system must securely handle transactions and provide order confirmations.

• Order Tracking and History:
  Customers must be able to track their order status in real-time and view their order history. Sellers should see order details, shipping requirements, and delivery statuses.

• Ratings and Reviews:
  After purchase, customers should be allowed to leave ratings and reviews for products. These should be visible to other buyers to assist in their purchasing decisions.

• Customer Support and Feedback:
  The platform should include a help center, support tickets, return requests, and feedback forms to handle customer service needs.

2. Non-Functional Requirements

These determine the quality and performance characteristics of the system.

• Scalability:
  The system should support a large number of simultaneous users, products, and transactions without affecting performance, especially during high traffic periods like sales.

• Security:
  All transactions and user data must be encrypted and securely handled. Authentication protocols, secure payment processing, and data privacy measures must be in place.

• Availability and Reliability:
  The platform should be available 24/7 with minimal downtime. Backup systems and failover strategies should ensure business continuity.

• Performance:
  Page load time, search speed, and checkout process must be optimized for speed and smooth user experience, even under high load.

• Maintainability and Modularity:
  The system must be designed in a modular way, so features can be updated or added without affecting other parts of the platform. Clear logging and monitoring should be in place to track issues.

• Cross-Platform Support:
  The platform must work across web browsers and mobile devices (both Android and iOS), ensuring consistency in user experience.