What are the differences between the BLOB and TEXT datatypes in MySQL?

TEXT and CHAR or nchar that will typically be converted to plain text so you can only store text like strings.

BLOB and BINARY which mean you can store binary data such as images simply store bytes.

Blob datatypes stores binary objects like images while text datatypes stores text objects like articles of webpages

TEXT and CHAR will convert to/from the character set they have associated with time. BLOB and BINARY simply store bytes.

BLOB is used for storing binary data while Text is used to store large string.

BLOB values are treated as binary strings (byte strings). They have no character set, and sorting and comparison are based on the numeric values of the bytes in column values.

TEXT values are treated as nonbinary strings (character strings). They have a character set, and values are sorted and compared based on the collation of the character set.

http://dev.mysql.com/doc/refman/5.0/en/blob.html