A dotfile is a file whose name begins with a dot (.), such as ".bashrc" or ".htaccess". These files are commonly used in Unix-like operating systems to store configuration settings for applications and user environments. Dotfiles are typically hidden by default in file listings to prevent accidental modification or deletion. In cybersecurity, dotfiles can be significant because attackers may target, modify, or hide malicious code within them. Proper management and monitoring of dotfiles are important to maintain system security and integrity.