hard link and soft link?
hard link associates 2 or more file names with the same inode. Hard links share the same data blocks on the hard disks, while they continue to behave as independent files

Soft link or symbolic link (or for short: symlink): a small file that is a pointer to another file. A symbolic link contains the path to the target file instead of a physical location on the hard disk. Since
inodes are not used in this system, soft links can span across partitions.