A smart mob is a group that, contrary to the usual connotations of a mob, behaves intelligently or efficiently because of its exponentially increasing network links. This network enables people to connect to information and others, allowing a form of social coordination. Parallels are made to, for instance, slime molds. The concept was introduced by Howard Rheingold in his book Smart Mobs: The Next Social Revolution. According to Rheingold, smart mobs are an indication of the evolving communication technologies that will empower the people. In 2002, the "smart mob" concept was highlighted in the New York Times "Year in Ideas."

These growing technologies include the Internet, computer-mediated communication such as Internet Relay Chat, and wireless devices like mobile phones and personal digital assistants. Methodologies like peer to peer networks and pervasive computing are also changing the ways in which people organize and share information.

One reason for the rise of smart mobs is the ever decreasing cost of increasingly powerful microprocessors which have allowed them to permeate throughout society — they are embedded in everything from boxes to clothes. Depending on how the technology is used, smart mobs may be beneficial or detrimental to society. Rheingold warns of the use of the technology by some to create a society similar to the one seen in George Orwell's 1984 or by terrorists for their malicious purposes.

Smart Mobs are sometimes manipulated by the dispatchers who control the 'mobbing system' (i.e., those who own the contact list and the means to forward instant messages to a group) and induced to cause distress and aggravation to individuals who have been targeted or singled out for whatever reason.

There is a tendency to keep the dynamics of smart mobbing 'covert', and not to discuss such incidents on the internet.