What is Category management and what is the real difference it has with traditional procurement?

The Chartered Institute of Procurement & Supply defines Category Management as:

"organising the resources of the procurement team in such a way as to focus externally onto the supply markets of an organisation (as against having a focus on the internal customers or on internal Procurement departmental functions) in order to fully leverage purchasing decisions”. A ‘category’ is the logical grouping of similar expenditure items, such as spend on advertising agency services or IT hardware. Category management is the sourcing process used to manage these categories to satisfy business needs while maximising the value delivered from the supply base”.

Actually, Could not find definition better than the one provided by Mr. Nadeem Asghar