Angular Interview Practice Exam 2025 - Free Angular Practice Questions and Study Guide

Virtual Scroll in Angular is designed to optimize the rendering of long lists of items by only displaying a subset of those items in the view at any given time. This approach significantly enhances performance and responsiveness, particularly when dealing with extensive datasets.

When you implement Virtual Scroll, it detects the visible area of the scrollable container, and it renders only those items that fit within this visible space. As the user scrolls, items that move out of the viewport are removed from the DOM, while new items that come into view are dynamically added. This selective rendering reduces the memory footprint and improves rendering speed, ensuring smooth scrolling experiences.

Such a technique is particularly beneficial in scenarios where long lists could lead to performance bottlenecks, making it easier for developers to handle large amounts of data without compromising the application's user interface or user experience.

The other options do not accurately describe the primary purpose of the Virtual Scroll feature: the first option suggests an increase in rendered items, which contradicts the efficiency aim of Virtual Scroll; the second option regarding layout flexibility is unrelated to the function of controlling item rendering; and the last option on automatic pagination implies a different approach to managing large datasets that is not encapsulated by Virtual Scroll's methodology.