Algorithms are a set of procedures to generate the answer to a problem. An example is the algorithm to find the solution to a quadratic equation, which most of us were taught while learning algebra. Not only was I taught the algorithm, but our entire class was invited to tattoo it on our stomachs so that we could solve quadratic equations by rote.

At Home in the Universe: The Search for Laws of Complexity, Chapter 1 (p. 21)