Confusing with storage backends

[howard chen]

>From the doc:
https://www.varnish-cache.org/docs/trunk/users-guide/storage-backends.html

In the "Intro"...

>>"The default configuration is to use the malloc backend with a limited
size."

And under the "file"

>>This is the default storage backend and unless you specify another
storage this one will used along with Transient storage.

Seems contradicting?
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