Oracle Applications is an enterprise resource planning software package developed by Oracle Corporation. It includes various modules for functions like finance, manufacturing, supply chain management, and human resources. The key features of Oracle Applications include integrated master data, transaction data, and financial data across modules. A new module can be developed for Oracle Applications by registering the module, creating a schema for it, setting up the necessary directory structure, and building forms for the module using the Form Builder tool while following Oracle's coding standards.