[GENERAL] Need help - Regarding Data Compression in PostgreSQL.

[salma]

Hi,
 
I'd like to know:
1. If it is possible to compress data in the PostgreSQL.
2. What kind of compression, if any, is available in PostgreSQL.
3. If compression is available, what kind of disk space savings can I expect 
using it.
 
I'd appreciate it if you can take some time and get me this information.
 
Thanks,
Salma