Wikipedia invites readers to help build an encyclopedia
Wikipedia launched in January 2001 with an ambition to make shared knowledge widely accessible.

Context and provenance
Wikipedia launched on January 15, 2001. Its organizing idea connected an encyclopedia to participation by volunteers, allowing the collection to grow through many people's contributions instead of treating readers only as an audience. The Wikimedia Foundation's anniversary account emphasizes both the project and the community that maintains it. That community dimension matters because an editable page is only one part of an encyclopedia: sources, discussion, revision, and continuing care give the text its value. Wikipedia's history also connects access with reuse and multilingual participation. Its scale should not obscure the individual acts of reading, checking, correcting, and explaining on which the project depends.
Why it matters
Editorial perspective: Knowledge becomes a process as well as a product when readers can participate in revision. The useful question is not whether collaboration eliminates mistakes, but whether it provides visible and durable ways to discover and improve them.