CPV codes are a system of classification for public procurement which uses standardized vocabulary to help procurement personnel classify their contract notices consistently and to make it easier for suppliers and contracting authorities to find notices.
CPV stands for Common Procurement Vocabulary and the system was developed by the European Union as a tool to improve transparency and efficiency in public procurement. Using a standardized coding format also makes it easier to facilitate the processing of tenders published in the Official Journal of the European Union (OJEU). The use of CPVs has been mandatory in the European Union since 1 February 2006.
The CPV system consists of a main vocabulary, which defines the type of contract; and a supplementary vocabulary, which adds further qualitative information about the contract. The main vocabulary is made up of approximately 9450 terms, listing goods, works and services which are commonly used in procurement.
Source: https://www.bipsolutions.com/what-are-cpv-codes/