Last week, Wikipedia received an unusual prompt. For one thing, it dealt with sensitive subject matter. And it didn’t come from a person — it came from YouTube, the largest video site on the internet.

People using CIA and FBI computers have edited entries in the online encyclopedia Wikipedia on topics including the Iraq war and the Guantanamo prison, according to a new tracing program. The changes ...

Is Wikipedia’s fundraising truly necessary? You’ve likely encountered that pop-up on Wikipedia asking for donations, claiming that without your support, they might struggle to keep the site running.

It’s hard to remember what online life was like before the advent of Wikipedia nearly two decades ago. Every day, millions of people turn to the nonprofit site in moments of curiosity or confusion, ...