In this book, Bartosz Brożek attempts to decipher the practice of rule-following with the use of the tools offered both by contemporary philosophy and neuroscience. The Author claims – in the Wittgensteinian spirit – that rule-following cannot be thought of in terms of individual mental states only: in order to explain what rules are, one needs to consider rule-following to be a communal practice. This stance is supported by a number of evolutionary scenarios and neuroscientific theories. The monograph culminates in an explication of rule-following in language, morality and mathematics.