We are announcing this morning an important development at Newsweek and The Daily Beast. Newsweek will transition to an all-digital format in early 2013. As part of this transition, the last print edition in the United States will be our Dec. 31 issue.

Meanwhile, Newsweek will expand its rapidly growing tablet and online presence, as well as its successful global partnerships and events business.

Newsweek Global, as the all-digital publication will be named, will be a single, worldwide edition targeted for a highly mobile, opinion-leading audience who want to learn about world events in a sophisticated context. Newsweek Global will be supported by paid subscription and will be available through e-readers for both tablet and the Web, with select content available on The Daily Beast.

Four years ago we launched The Daily Beast. Two years later, we merged our business with the iconic Newsweek magazine—which The Washington Post Company had sold to Dr. Sidney Harman. Since the merger, both The Daily Beast and Newsweek have continued to post and publish distinctive journalism and have demonstrated explosive online growth in the process. The Daily Beast now attracts more than 15 million unique visitors a month, a 70 percent increase in the past year alone—a healthy portion of this traffic generated each week by Newsweek’s strong original journalism.

At the same time, our business has been increasingly affected by the challenging print advertising environment, while Newsweek’s online and e-reader content has built a rapidly growing audience through the Apple, Kindle, Zinio and Nook stores as well as on The Daily Beast. Tablet-use has grown rapidly among our readers and with it the opportunity to sustain editorial excellence through swift, easy digital distribution—a superb global platform for our award-winning journalism. By year’s end, tablet users in the United States alone are expected to exceed 70 million, up from 13 million just two years ago.

Currently, 39 percent of Americans say they get their news from an online source, according to a Pew Research Center study released last month. In our judgment, we have reached a tipping point at which we can most efficiently and effectively reach our readers in all-digital format. This was not the case just two years ago. It will increasingly be the case in the years ahead.

It is important that we underscore what this digital transition means and, as importantly, what it does not. We are transitioning Newsweek, not saying goodbye to it. We remain committed to Newsweek and to the journalism that it represents. This decision is not about the quality of the brand or the journalism—that is as powerful as ever. It is about the challenging economics of print publishing and distribution.

Newsweek is produced by a gifted and tireless team of professionals who have been offering brilliant work consistently throughout a tough period of ownership transition and media disruption. Regrettably we anticipate staff reductions and the streamlining of our editorial and business operations both here in the U.S. and internationally.

Exiting print is an extremely difficult moment for all of us who love the romance of print and the unique weekly camaraderie of those hectic hours before the close on Friday night. But as we head for the 80th anniversary of Newsweek next year we must sustain the journalism that gives the magazine its purpose—and embrace the all-digital future.Tina Brown is the editor-in-chief and founder of The Newsweek Daily Beast Company. Baba Shetty is its CEO.