INODE is a structure which acts as an identity for all files and objects. Type a command in the shell “ls -i”. The numbers which are displayed at the adjacent of files and folders, these are INODE numbers which are assigned to each file that contains information about the file. The system uses this number to identify the file. Information like the size of the file, when the file was modified etc is contained in an INODE number.
The questions based on INODE is the most common linux interview question you may come across in your linux interview. So, read well and get enough knowledge even if you are not familiar with it and get ready with the answer.
