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Guix and its package collection are updated by running guix
pull. By default guix pull downloads and deploys Guix itself
from the official GNU Guix repository. This can be customized by
providing a file specifying the set of channels to pull from
(see Invoking guix pull). A channel
specifies the URL and branch of a Git repository to be deployed, and
guix pull can be instructed to pull from one or more channels.
In other words, channels can be used to customize and to
extend Guix, as we will see below. Guix is able to take into
account security concerns and deal with authenticated updates.