devx article - Mailing list pgsql-hackers

Hi all,
reading this article:

http://www.devx.com/dbzone/Article/20743

I notice on page 2:

"New versions of PostgreSQL support standard row-level
locking as an option, but MVCC is the preferred method"

What this does mean ?



Regards
Gaetano Mendola