Encarta had text. It was mostly text. But sometimes text isn't the best medium for conveying some information. For example, maybe there's an article about lizards. You can describe the way a lizard moves, but it makes much more sense to have a video embedded that can show you what that movement looks like with all of its nuances that would be difficult to describe and understand in text.
So, think of wikipedia, but curated by professional library scientists and verified subject matter experts with first source video and audio clips (and photos) embedded where helpful.
Encarta had text. It was mostly text. But sometimes text isn't the best medium for conveying some information. For example, maybe there's an article about lizards. You can describe the way a lizard moves, but it makes much more sense to have a video embedded that can show you what that movement looks like with all of its nuances that would be difficult to describe and understand in text.
So, think of wikipedia, but curated by professional library scientists and verified subject matter experts with first source video and audio clips (and photos) embedded where helpful.