What is difference between Trace and Debug?

The system.Diagnostics namespace contains the Debug and
Trace classes that include shared methods.

The diffetrnce between these two classes is in the way
Trace and Debug statements are treated at the of creating a
release bulid.

Trace statements are included by default when the program
is compiled in to release build,where as debug statements
are not.The Debug class is used for debugging,however, the
Trace class is used for testing and optimization even after
an application is compiled and released.