whai is toad in database?

what is main difference between toad and oracle9i?how to use in toad?

Oracle9i Database provides efficient, reliable, secure data management for high-end applications such as high-volume on-line transaction processing (OLTP) environments, query-intensive data warehouses, and demanding Internet applications.

TOAD is an industry-standard tool for application development. Using TOAD, developers can build, test, and debug PL/SQL packages, procedures, triggers, and functions. TOAD users can create and edit database tables, views, indexes, constraints, users, and roles.
TOAD is a powerful, low-overhead tool built around an advanced SQL and PL/SQL editor. It has an easy to use, fast, and effective interface. The GUI object browsers provide quick access to database objects.

while oracle 9i is a database
TOAD is tool for interaction with database.