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The Explanatory Supplement produced by the Planck Collaboration is a reference text accompanying the public data delivered from the operations of the European Space Agency’s Planck satellite during its mission, and includes descriptions of all the products. The descriptions from the 2013 and 2015 products can be found under Previous Releases at the end of each subsection. Not all the products will be updated in the 2017 release, in which case the description of the product corresponds to the last version. There are three data releases of Planck products:

• PR1 in 2013 (*.R1.??)
• PR2 in 2015 (*.R2.??)
• PR3 in 2017 (*.R3.??)

1. Introduction
   1. The Planck mission
   2. The spacecraft
   3. Ground segment and operations
   4. Survey scanning and performance
   5. Questions and answers
2. The Instruments
   1. HFI design, qualification, and performance
      1. Cryogenics
      2. Cold optics
      3. Detection chain
      4. Operations
      5. Performance summary
      6. Annexes
   2. LFI design, qualification, and performance
      1. Instrument description
      2. Ground tests
      3. In-flight calibration
      4. Performance summary
      5. Systematic effects
      6. Sorption cooler
      7. Annexes
3. Data processing
   1. HFI data processing
      1. Pre-processing
      2. TOI processing
      3. ADC correction
      4. Beams
      5. Mapmaking
      6. Spectral response
      7. Internal overall validation
      8. Summary of HFI data characteristics
      9. Appendix to the 2017 HFI DPC paper
   2. LFI data processing
      1. Pre-processing
      2. TOI processing
      3. Beams
      4. Galactic stray light removal
      5. Mapmaking
      6. Systematic effects uncertainties
      7. Internal overall validation
      8. Summary of LFI data characteristics
   3. HFI/LFI joint data processing
      1. Detector pointing
      2. Compact source catalogues
      3. Astrophysical component separation
      4. CMB power spectra and Planck likelihood code
4. Planck Legacy Archive: mission products
   1. Maps
      1. Frequency maps (sky temperature and polarization maps)
      2. CMB maps
      3. Foreground maps (astrophysical components and specially processed maps)
      4. Correction maps
      5. Masks
      6. Simulation data
      7. Dates of observations
   2. Catalogues:
      1. PCCS
      2. PSZ
      3. PGCC
      4. PHZ
   3. Cosmology
      1. CMB spectrum and likelihood code
      2. Cosmological parameters and MC chains
   4. Time-ordered data
   5. HFI HEALPix Rings
   6. Beams
      1. Scanning beams
      2. Optical beams
      3. Effective beams
   7. Instrument model
   8. Planet-related data
   9. Software utilities
      1. Planck Sky Model simulation tool
      2. Mapmaking from timelines and ring tools
      3. FEBeCoP effective beam extraction and convolution tools
      4. Unit conversion and colour correction
5. Operational data
   1. Survey history data
   2. Satellite history data
   3. Planck operational state history
   4. Space radiation environment monitor
6. Appendix
   1. Glossary
   2. List of acronyms