Template Engine
A template engine is a software tool that processes templates (files with placeholders) and data to generate dynamic output, typically in web development for creating HTML pages, emails, or documents. It separates presentation logic from business logic, allowing developers to embed variables, loops, and conditionals in templates that are rendered with specific data at runtime. This promotes cleaner code, reusability, and easier maintenance in applications.
Developers should learn and use template engines when building dynamic web applications, such as with server-side frameworks like Django, Express.js, or Spring, to generate HTML content efficiently and securely. They are essential for avoiding code duplication, handling user input safely to prevent XSS attacks, and enabling non-technical team members to edit templates without altering backend code. Use cases include rendering product listings in e-commerce sites, personalizing user dashboards, or automating email notifications.