Andreessen's first trend dealt with the financial services sector, and he reiterated his outspoken belief in the long-term value of bitcoin .

As an Internet pioneer turned venture capitalist, Andreessen's large wingspan touches just about every aspect of technology. His firm, Andreessen Horowitz, has investments in big players like Facebook , Twitter , Foursquare , Skype and Airbnb, as well as countless startups across a wide range of industries and platforms. Andreessen himself sits on the boards of Hewlett-Packard, eBay and Facebook, along with other companies.

When legendary venture capitalist Marc Andreessen spots a trend, people tend to listen—and this week he shared with CNBC the top three tech trends that excite him.

"We're very excited about bitcoin as a key enabling technology for very broad-based change in how financial services work," he said Tuesday. "Every sector of financial services is going to have a set of (bitcoin-oriented) startups coming out of it."

Second, Andreessen highlighted the "huge opportunity" in online education, particularly in the developing world.

"There's so many kids coming up in the developing world now where they're going to grow up with a smartphone in their hand," he said. "They're going to want to get an education like our kids are able to get … they're going to want to get that education on their smartphone."

Andreessen said one of the companies that his firm has invested in, Udacity, is aiming to educate billions across the globe.

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Third, Andreessen said that healthcare and technology are merging in new and important ways.

"What we're seeing now is a new generation of healthcare startups that are software-meets-healthcare," he said. "We're seeing a lot of work around online access to healthcare, online medical records, online access to doctors, online access to healthcare information … more and more computer science-meets-healthcare."

—By CNBC's Michael Newberg