[ NOVICE ] Name of database under postgresSQL

Hi,

I don't understand what is the name of database under postgresql.
With InitDB we put nothing else the directory.
THe first connection , I put psql -U <user> template1
which seem to create a default database template1.
Then, I create 2 database (CREATE DATABASE ) TEST and TEST2.

But with ODBC or directly in CYGWIN shell , if I try to connect to TEST or
TEST2
it says that it doesn't recognize these DB.

I don't understand.