Google Books Ngram Viewer Shows 'Digital Book' Peaked in 2004

According to new Google Books Ngram Viewer, use of the words “digital book” in books peaked in 2004.

Since then, the word “eBook” has dominated the conversation, dwarfing the use of the words “digital book.” In the graph embedded above, you can see the increase (click to enlarge).

Here’s more about the tool: “When you enter phrases into the Google Books Ngram Viewer, it displays a graph showing how those phrases have occurred in a corpus of books (e.g.,