Overview Back in the "old days", the types of data that databases were required to store were fairly straight forward--text, numbers, maybe a true/false field. Modern database users, however, want to store all sorts of things in databases. Music files, specialized graphics, even video footage can be stored as fields in a database. How do DBMSs (Database Management Systems)  handle all these different file types? One solution is to store data as a BLOB--a binary large object. Data stored as a BLOB is stored in the database in binary format, the same format used to represent the data in computer memory. Because every type of data can be expressed in binary format, any type of data can be stored as a BLOB, making the format extremely flexible and popular for storing diversely formatted data. Follow the links below to find out more about the BLOB data type.

General Information ( is a great place to start looking for information about the BLOB data type. In addition to an accurate definition, the page also provides links to other database-related terms. The definition found at this page provides additional insight into the history of BLOBs and their current applications. Wayne Lambright, the author of the Web page, answers questions that you might have about the BLOB data type in his article “BLOB Upload / Starting Point.” For more general information about BLOB data, visit either or

Additional Links To see a detailed overview about BLOB and databases, visit this Web pageThis page also contains information about managing BLOB data in many of today’s most popular DBMS.