Katie Couric is going digital and tells 'Glamour' magazine a few reasons why.

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Why is Katie Couric, a longtime star of broadcast networks, becoming the "face of Yahoo?" It's not about the money, it's about the reach, she tellsGlamour magazine online.

"The (online) real estate is so valuable," she says in an interview. "The reach is extraordinary. I learned that when I did my interview with Sarah Palin for CBS and more people saw it online than on a TV platform. ... I'm excited to take advantage of that in the best possible way."

Glamour says that in October 2013, Yahoo sites drew in about 196 million unique visitors according to ComScore, with 82 million unique visitors across the Yahoo-ABC News network.

Couric, veteran of NBC, CBS and now ABC, is becoming the global anchor for Yahoo.com starting next year.

Word leaked Friday that it was going to happen; Yahoo CEO Marissa Mayer made it official on Tumblr on Monday.

Couric will produce video features for the Yahoo home page, while also continuing to host her syndicated daytime talk show, Katie, on ABC. She says she hopes to "do good, strong, smart things" for Yahoo.

Once the sweetheart of NBC's Today show, Couric sounds a little disenchanted with the whole morning chat-show setup.

"Morning-show segments are often so short and they've gotten increasingly light over the years," she says.

Another reason for making the switch might be her new boss, Mayer, who's trying to shake up Yahoo and hasn't minded knocking some things over to do it. She's started beefing up the news team with hires of other high-profile journalists.

Couric says Mayer wants Yahoo to produce quality journalism.

"It's always great news when we see more women (like Mayer) in these positions of authority, and I think it's great that she is making some bold moves," Couric says.

"At this point in my career, I like great leaders. I think they can come in a skirt or in a suit or in a pair of jeans and a hoodie. I really admire Marissa, not as an impressive woman — (but) as an impressive person."

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