Explain the difference between 'ENOENT' and other file system-related errors, such as 'EACCES' or 'EISDIR'.

'ENOENT' (No such file or directory) indicates the target does not exist at the given path. 'EACCES' (Permission denied) means the program lacks the necessary permissions to access the file or directory. 'EISDIR' (Is a directory) means the operation (like `fs.readFile`) was attempted on a directory instead of a file. Understanding these distinctions is crucial for pinpointing the root cause of the error.