This document provides an introduction to REDD+, which stands for reducing emissions from deforestation and forest degradation. REDD+ emerged from UNFCCC negotiations in 2005 as a way to reduce greenhouse gas emissions by paying tropical countries to conserve their forests. The mechanism calculates emissions reductions based on a national baseline and provides compensation based on tons of CO2 not emitted. REDD+ now includes conservation, sustainable forest management, and increasing forest carbon stocks. Key challenges include governance reforms, monitoring emissions accurately, and implementing social and environmental safeguards.