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 crash happens, users may see error messages or a frozen screen, requiring a restart to regain access. To prevent system crashes, regular maintenance is essential. This includes updating software, running antivirus scans, and ensuring that hardware components like hard drives and RAM are in good condition. Users can also create backups of important data to minimize the impact of a crash.