Last updated: 2025 – Oracle 19c and 21c are common LTS releases. Oracle 23c client is also available but still maturing.
The is a software layer that allows 64-bit applications to communicate with an Oracle Database. It includes the necessary libraries, drivers (like ODBC and OLE DB ), and networking components ( SQL*Net ) to facilitate this connection. oracle 64 bit client
This led to the "DLL Hell" story.