A system crash occurs when a computer or software application unexpectedly stops functioning, often leading to data loss or corruption. This can happen due to various reasons, such as hardware failures, software bugs, or conflicts between different programs. When a system crashes, users may experience a frozen screen, error messages, or the inability to access files. To recover from a system crash, users may need to restart their device or restore it to a previous state. Regularly saving work and maintaining backups can help minimize the impact of a crash. Understanding the causes of crashes can aid in preventing future occurrences and ensuring smoother operation of systems like Windows, macOS, or Linux.