The backend is the part of a website or application that users don’t see. It works behind the scenes to manage and process data, run the server, connect to databases, and handle all the logic that powers the website. When you log in, make a purchase, or submit a form — the backend makes it all work.

SQL Server is a relational database management system (RDBMS) developed by Microsoft. It’s used to store, manage, and retrieve data for applications — especially in business environments. SQL Server uses Structured Query Language (SQL) to interact with the database, allowing developers to create tables, insert and retrieve data, and run complex queries.

In an eCommerce platform, the backend is the system that handles all the business logic, data processing, and communication with databases. When you browse products, add items to your cart, or place an order, the backend processes these actions securely and efficiently. SQL databases play a vital role by storing and managing all the important data like product details, user accounts, orders, payments, and inventory. Using SQL, the backend can quickly retrieve information — for example, showing product availability or customer order history — and update records as needed, such as reducing stock after a purchase.