Below are the basics that will help you understand the nature of charging a BEV, like the difference between AC and DC electrical currents, the different charging connectors and the speed levels available to charge a BEV.
AC versus DC
AC vs. DC for charging BEVs
Condensed from Dan Landry's Post found on the Fully Charge Driving website
It may be helpful to first clarify the difference between AC (alternating current) and DC (direct current).
AC is the type of current that is supplied to homes and businesses by the electrical grid. AC charging an EV battery is slower, as it has to first be converted into DC current.
DC is the only type of current that an EV battery will store. DC charging an EV battery is faster than AC charging, since it’s given at a much higher voltage and doesn’t have to be converted.
EVs will all have an onboard charger (i.e. inside the car) which acts as a converter to change any AC current from the grid into DC current for the battery.