A BLOB is a binary large object that can hold a variable amount of data. There are four types of BLOB in MySQL, they are as follows,
They all differ only in the maximum length of the values they can hold.
A TEXT is a case-insensitive BLOB. The four TEXT types
They all correspond to the four BLOB types and have the same maximum lengths and storage requirements.
The only difference between BLOB and TEXT types is that sorting and comparison are performed in case-sensitive for BLOB values and case-insensitive for TEXT values.