What is the file extension for gzip compressed files?

The file extension for gzip compressed files is .gz. Gzip, which stands for GNU zip, is a widely used file compression program that reduces the size of files for storage or transmission. When a file is compressed using gzip, it typically retains the original file name with the addition of the .gz extension, indicating that it has been compressed.

For example, if you compress a file named "example.txt" using gzip, the resulting compressed file will be named "example.txt.gz". This extension helps users and systems easily identify that the file is compressed with gzip and needs to be decompressed before access.

The other options represent different compression formats: .bz2 is associated with bzip2, .zip refers to a different compression method that allows for archiving and compressing files together, and .tgz is a tar archive that has been compressed using gzip (essentially a combination of .tar and .gz). However, the direct answer to file extensions specifically for gzip compressed files is .gz.