The Recommender Systems Challenge consists of the two tracks:

Benchmarking CAMRa Track

The Context-Aware Movie Recommendation Track Focuses on context-aware recommendations in the movie domain. The challenge focuses on finding the correct users to recommend specific items for in order to gain a large impact in terms of user-interaction.

More information on the track available here: CAMRa

Exploratory ScienceRec Track

The Scientific Paper Recommendation track focuses on the recommendation of research papers.

More information on the trackavailable here: ScienceRec