pg_dump fundenental question

Hello all,

I have hopefully an "easy" question.

If I issue the pg_dump command with no switches or options i.e.

/usr/local/pgsql/bin/pg_dump -v dbabcd > /data3TB/Backup/dbabcd

Is their any "default" compression involved or not? Does pg_dump talk to zlib during the dump process given that I have not specified any compression on the 
command line? (see above).

Your considered opinions would be much appreciated.


Regards,


Henk