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Shows the conditioning of the VIN input voltage - as supplied either via the power jack (plus some pre-processing) or a header pin - and provision of stabilised +5V and +3V3
In the Arduino interactive board viewer the dual opamp LMV358LIST with schematic name lC7 appears in a few different places in the schematic (SCH) viewer. (We'll see later that the circuit for the builtin LED piggy-backs off the other opamp unit within that dual opamp package LMV358LIST.)
We can see that it is being used as a single supply opamp, with the +5V to VCC+ and GND to VCC-.