There are two types of conformance levels for ODBC drivers—ODBC API and ODBC SQL grammar (see SSL client/server authentication). Knowing the conformance levels helps you determine the range of functionality available through the driver, even if a particular database does not support all of the functionality of a particular level.
For ODBC API conformance, most quality ODBC drivers support Core, Level 1, and a defined set of Level 2 functions, depending on the database being accessed.
