What is universal data access?

Universal data access as implemented by UNIDAC is exactly what it implies - a single, native set of Delphi / C++ components that provide interfaces to a wide range of databases, from SQLite to SQL Server, plus a number of cloud-based services. All in one box. With a few limitations, you can take code originally written to run against, for example, MySQL and recompile with minimal changes, to run against Oracle.