This document is an excerpt from the EUR-Lex website
Codification is the process of bringing together a legal act (or several related acts) and all its amendments into a single new act.
Codification can take 2 forms:
Unlike in the case of consolidation (i.e. the unofficial simplification of a legal act incorporating its amendments), the new act goes through the full legislative process (e.g. ordinary legislative procedure, consultation procedure or consent procedure) and replaces the acts that are being codified.