Some confusion on repos

[Antonio M]

After latest updates fedora-release-13-0.6.noarch I found that
fedora-updates was disabled and fedora-updates-testing was enabled...

[updates-testing]
name=Fedora $releasever - $basearch - Test Updates
failovermethod=priority
#baseurl=http://download.fedoraproject.org/pub/fedora/linux/updates/testing/$releasever/$basearch/
mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=updates-testing-f$releasever&arch=$basearch
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-$basearch

I don't understand the meaning of this choice.

Tnx for help

-- 
Antonio Montagnani
Skype : antoniomontag
SIP: antoniomontag at ekiga.net