JDBC-ODBC Bridge driver (is a driver that uses native(C language) libraries and makes calls to an existing ODBC driver to access a database engine).

The type of JDBC (Java Database Connectivity) driver used in a project depends on the specific requirements and architecture of the project. There are four types of JDBC drivers:

Type 1: JDBC-ODBC Bridge Driver:
- This driver translates JDBC calls into ODBC (Open Database Connectivity) calls. It requires the presence of an ODBC driver, which acts as a bridge between the Java application and the database. However, this type of driver is rarely used in modern applications due to its limitations and the need for additional dependencies.
Type 2: Native-API Driver:
- This driver uses a database-specific native library to communicate with the database. It directly communicates with the database server using a vendor-specific API. While it may offer better performance than the Type 1 driver, it is still less common in modern applications.
Type 3: Network Protocol Driver:
- This driver translates JDBC calls into a vendor-independent network protocol, which is then used to communicate with a middleware server. The middleware server converts these calls into database-specific calls. This type of driver provides better flexibility and portability compared to Type 1 and Type 2 drivers.
Type 4: Thin (Pure Java) Driver:
- This driver is a pure Java implementation that communicates directly with the database server. It doesn’t rely on any native code or middleware. Type 4 drivers are widely used in modern Java applications because of their platform independence and better performance compared to Type 1, Type 2, and Type 3 drivers.

When answering the question about the type of driver used in a project, you would typically specify whether it’s a Type 1, Type 2, Type 3, or Type 4 driver based on the project’s architecture and requirements. The most common and recommended choice for modern Java applications is the Type 4 (Thin or Pure Java) driver.