Oracle Application Express (APEX) is an application that you can use to develop database-centric web applications with almost no code. It is mainly used for developing in-office applications and Oracle APEX is also a license-free feature of Oracle Database. It is a fast and secure web application development platform and does not require any Application Server. It is a combination of known technologies (SQL, PL / SQL, HTML, CSS) in a framework. It keeps all information, including source codes, in database tables.