These are the built-in large object data types.
• BLOB, CLOB, and NCLOB are stored internally whereas BFILE is stored externally
• The BLOB data type stores binary large objects.
• The CBLOB data type stores character large objects.
• The NCBLOB data type stores character large objects in a multibyte national character set.
• The BFILE data type enables access to binary file LOBs that are stored in file systems outside the Oracle database.
All these data types have a capacity of 4GB