SENTINEL-2 products available for users (either generated by the ground segment or by the SENTINEL-2 Toolbox) are listed in Figure 1.
Figure 1: SENTINEL-2 product types
Products are a compilation of elementary granules of fixed size, along with a single orbit. A granule is the minimum indivisible partition of a product (containing all possible spectral bands).
For Level-1C and Level-2A, the granules, also called tiles, are 100x100 km2 ortho-images in UTM/WGS84 projection. Download the Sentinel-2 tiling grid kml.
Figure 2: Graphical Representation of SENTINEL-2 Core Products. *Note that L2A BOA reflectances are generated at users' side by a processor running on ESA's SENTINEL-2 Toolbox. The possibility to make it a standard systematic product from the core ground segment is currently under assessment at ESA as part of the CSC evolution activities.