➀ Virtual memory is a crucial concept in Android OS, allowing applications to use more memory than physically available by leveraging secondary storage. ➁ It simplifies memory management for developers and enhances security by isolating application memory spaces. ➂ Android uses techniques like paging, swapping, and the Low Memory Killer to efficiently manage memory, though these can impact performance. ➃ Despite advancements in SSD technology, virtual memory remains essential for optimizing system performance and resource utilization.