In 2012, venture capital firms invested more than $27 billion across 3,417 deals.

Although the number of VC financings declined 3% from 2011 to 2012, many VCs are expressing optimism about prospects in 2013 and beyond, according to PitchBook’s annual venture capital rundown report. Much of the confidence stems from the continuing development of disruptive technologies, such as mobile, cloud computing, and big data, that have the capability of changing how both consumers and businesses utilize and interact with technology.