BLOB (binary large object)----A binary large object is a container in which binary files can be stored.

In computers, BLOB is often the type of field used in databases to store binary files.

A BLOB is a large file; a typical BLOB is a picture or a sound file that, because of their size, must be handled in a special way (e.g., uploaded, downloaded, or stored in a database).

According to Eric Raymond, the main idea behind dealing with BLOBs is to make the file processor (e.g., a database manager) not care about what the file is, but rather how to deal with it.

But some experts emphasize that this approach to handling large data objects is a double-edged sword, and that it has the potential to cause problems such as storing binary files that are too large, which can degrade the performance of the database. Storing voluminous multimedia objects in a database is a classic example of how applications handle BLOBs.