There are many
official dumps of Wikipedia available for download. Most are intended to be loaded into a MediaWiki database to run a Wikipedia clone. However, there are also
static HTML dumps: every page is pre-rendered to HTML using MediaWiki's ordinary parser, so you can just dump it all on a web or file server.
Why is this useful? To set up fast read-only copies on intranets not connected to the Internet, or when your connection is slow or sporadic. On your laptop, say.
One caveat: the static HTML dump is about 5.5 GB large (with 7zip), but comes out to roughly 80 GB uncompressed, with many millions of files. (78GB actual disk usage on a reiser3 FS, YMMV.)
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