This paper describes Task 2 of the DCASE 2018 Challenge, titled
General-purpose audio tagging of Freesound content with AudioSet labels''. This task was hosted on the Kaggle platform asFreesound General-Purpose Audio Tagging Challenge''. The goal of the task is to build an audio tagging system that can recognize the category of an audio clip from a subset of 41 heterogeneous categories drawn from the AudioSet Ontology. We present the task, the dataset prepared for the competition, and a baseline system.