Files and folders with names beginning with . (a dot) are considered hidden and are not made visible by default in Linux. This means that file managers like Nautilus, Dolphin, or even command line tools such as ls will not automatically show files and folders with names beginning with ..
You can still use ls at the terminal to also list hidden files and folders.
$ cd temp/
$ ls file folder
$ ls -a . .. file folder .hidden-file .hidden-folder
Files and folders with names started with . (a dot) is considered hidden in Linux and other Unix-based operating systems such as *BSDs and macOS
$ ls -la total 16 drwxrwxr-x 4 user user 4096 Oct 31 09:27 . drwxr-xr-x 5 user user 4096 Oct 31 09:26 .. -rw-rw-r-- 1 user user 0 Oct 31 09:27 file drwxrwxr-x 2 user user 4096 Oct 31 09:26 folder -rw-rw-r-- 1 user user 0 Oct 31 09:27 .hidden-file drwxrwxr-x 2 user user 4096 Oct 31 09:26 .hidden-folder
. and .. are special folders which refers to current and one-up folder respectively
$ ls -la /home/user/temp/ total 16 drwxrwxr-x 4 user user 4096 Oct 31 09:27 . drwxr-xr-x 5 user user 4096 Oct 31 09:26 .. -rw-rw-r-- 1 user user 0 Oct 31 09:27 file drwxrwxr-x 2 user user 4096 Oct 31 09:26 folder -rw-rw-r-- 1 user user 0 Oct 31 09:27 .hidden-file drwxrwxr-x 2 user user 4096 Oct 31 09:26 .hidden-folder
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