2017 V2
DC Volts
Direct current (DC) is the unidirectional flow of electric charge. Direct current is produced by sources such as batteries, thermocouples and solar cells among others. The electric current flows in a constant direction, Positive (+VE) to the Negative (-VE), distinguishing it from alternating current (AC).
DC is used in various ways throughout a modern appliance, much of the PCB including the display and many fans are now powered by a DC supply.
The multimeter shown here is set and ready to measure DC Volts.
When reading any voltage (AC or DC) the value you see is the "potential difference" in charge between two points of a circuit. This is similar to reading a temperature differential across two points, if point one is 50 and point two is also 50 then the differential will be 0. If point one is 50 and point two 20 then the differential will be 30, this value is similar to the voltage.
This meter is reading a DC voltage.