While the format itself is safe, compressed files can hide malware. Always use Avast One or other security software to scan archives before extraction.
What Is a RAR File and How Do I Open It? ... RAR files are used to combine and compress multiple files when sending them together. What is a RAR file - Rarlab Download BASIC rar
A is a compressed archive that bundles multiple files into one smaller package. While the format itself is safe, compressed files
They offer better compression than standard ZIP files. While the format itself is safe