LatticeQCD is the discretized version of Quantumchromodynamics, the supposedly fundamental theory of the strong interaction. Like its continuous cousin it is populated by quarks, gluons and gauge fields. But it also contains various numerical approximation schemes which have no direct counterparts in continuum QCD. 
This talk will investigate the relations between latticeQCD and QCD. How do we get the lattice from the continuum? How do we know that it sensibly approximates the continuum? Which should we think of as more fundamental? Could we in principle get rid of one of them?
These questions touch upon philosophical aspects of latticeQCD -namely intertheory relations, approximations & idealizations and indispensability arguments - which predominant concepts of theory in philosophy of science are not very well equipped to deal with. I argue that latticeQCD and QCD are best understood as being different sides of the same coin, that is, they are modules of the same theory. To make sense of this claim I will briefly discuss Darrigol's framework of modular physical theories and illustrate how QCD and latticeQCD fit in.