Because 7z files can contain any data, including software or potentially harmful scripts, you should always verify the source before extracting it.
A file is a compressed archive containing one or more files, typically bundled to save space or for easier sharing. While the name suggests personal content like vacation photos or travel documents, the .7z extension indicates it was created using the 7-Zip archiver. How to Safely Open a .7z File holiday.7z
The format is popular for large collections, such as high-resolution photo albums or datasets, because it offers significantly better compression than standard ZIP files. Because 7z files can contain any data, including