This is the preferred method for modern deployment scenarios to avoid "DLL Hell" and conflicting Oracle client versions on the same server.
Some developers receive ODAC as part of an Oracle Database Client installation. oracle.dataaccess.dll version 4.112.3.0 download
Some developers need to deploy Oracle.DataAccess.dll without running the interactive installer. Oracle allows a “xcopy deployment” but with dependencies. This is the preferred method for modern deployment