Binary Large Object

What Does Binary Large Object Mean?

A binary large object (BLOB) is a data type that can store binary objects or data. Binary large objects are used in databases to store binary data such as images, multimedia files and executable software code.


A binary large object may also be known as a basic large object.

Techopedia Explains Binary Large Object

Binary large objects are primarily used in all database software. Generally, database software classifies binary large objects into two types: semi-structured data and unstructured data. XML files are categorized as semi-structured data, whereas images and multimedia data are unstructured data types. Both of these BLOBs are generally not interpretable by the database.

BLOBs are used mainly for storing pictures, sounds and multimedia files, so they have a comparatively larger size than most data types and can contain up to gigabytes of data. Besides databases, the term BLOB may also refer to a visual image in computer graphics that has a unique shape.


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Margaret Rouse is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical, business audience. Over the past twenty years her explanations have appeared on TechTarget websites and she's been cited as an authority in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine and Discovery Magazine.Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages. If you have a suggestion for a new definition or how to improve a technical explanation, please email Margaret or contact her…