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Application Express (ApEx)
Oracle Application Express (Oracle APEX), formerly called HTML DB, is a rapid web application development tool for the Oracle database. Using only a web browser and limited programming experience, you can develop and deploy professional applications that are both fast and secure. Oracle application express combines the qualities of a personal database, productivity, ease of use, and flexibility with the qualities of an enterprise database, security, integrity, scalability, availability and built for the web. Application Express is a tool to build web-based applications and the application development environment is also conveniently web-based.
A more generic description is needed, this is a copy from the Oracle ApEx Site
ApEx:XSS ApEx:SQL injection ApEx:URL Tampering ApEx:Session State Protection ApEx:Authentication ApEx:Authorization Schemes ApEx:Defence in depth ApEx:Interactive reports ApEx:Builder access