Many people are questioning the difference between REDD and REDD+, here is the ultimate answer to them:
 

REDD stands for:

Reducing Emissions from Deforestation and forest Degradation

REDD+ or REDD plus or REDD-plus:

extends REDD by

• Sustainable Forest Management
   
• Conservation of Forests
   
• Enhancement of carbon sinks

REDD++: Extends REDD+ by

• Low-carbon but high biodiversity lands

Besides REDD or REDD+ or REDD++ you may be interested in retrieving more background knowldege in:

• Is conservation the main deal of REDD+?

• Is illegal logging the main reason of deforestation?
  • What are the real drivers of deforestation?
     
  • Agriculture is the real driver of deforestation...
     
  • How is the EU combating deforestation?
     
• FLEGT, EU-ETR and VPA's - will that really stop illegal logging?
   
• FLEGT - a critical analyes...
   
• How about impact of sustainable forest management (SFM)  in the tropics?