Unix help!!?

What is the difference between hardlink and symbolic link and what is it related to inode?

Files in Unix filesystems use inodes as structures that hold the actual file data on disks. inode number uniquely identifies a physical file on disk.

Hard links are pretty much multiple names for the same physical file represented by the same inode. For example, file /home/bobby/doc1.txt may refer to the same physical file as /home/jimmy/doc88.txt if you make hard link. If I am Bobby and I delete doc1.txt, doc88.txt will still exist, and the other way round. The two (or more) hard links are equal for all file operations and are seen as regular files by the OS.

Symbolic links are just labels that redirect to another file by name, not by physical inode number. They are not unlike Windows shortcuts. Symbolic link is a special type of files that holds the name of another file or directory.
The other file or directory may not exist, in which case symbolic link is considered broken.

Multiple hard links for the same file can only exist within one filesystem. Symbolic links may span across filesystems.

Renaming or deleting file that is a target of symbolic link will break the symbolic link.
Renaming or deleting a file that is hardlinked under another name will not have any effect on other names.

It is not mentioned very often, but hard links do exist in Windows on NTFS filesystems.

a hardlink is actually the document/object a symbolic link is similar to placing a shortcut on a PC desktop (or alias on a Mac) it's not the object itself it just points to the actual object.