Hi Prasad, There are four types of drivers. 1. JDBC - ODBC Bridge.. The Java language uses the already existing ODBC connection and thru the JDBC-ODBC bridge u can access the database and then open the connection. 2. Native API on basis This type of driver converts the java commands to the client specific SQL commands and then you can open the connection. 3. JDBC Net This is pure java. 4. Native API pure java This is the native java method and is system independent.