differences SQL injection with SQL blind

• SQL injection:

SQL injection is a hacking technique by manipulating the syntax of SQL (Structured Query Language). data base with SQL processing is done by sending commands (queries) are structured. These techniques include the commands that are used in the database via the URL.

SQL injection usually occurs because of lack telitian programmers to create scripts that will be the SQL query.
hacker can do assault by entering the command in double quotes ('), a minus sign (-), (|) ,(=) and many other code.
and usually an error occurs. and the error manifold.
one example :

Error : You have an error in your SQL syntax. Check the manual that corresponds to your MySQL server version for the right syntax to use near '\'' at line 1

• Blind SQL Injection 

Blind SQL is the name of the technique of attack. This technique is done by inserting SQL syntax or command in a web that has vulnerabilities (security holes) to browse the database, but can access the server directly using shell or by posting on the website backdor.

source: http://farizy4n.blogspot.com/2010/12/sql-blind-sql-injection.html