Voltage is defined as the electricpotential difference between the two ends of the conductor.  In other words the voltage is defined as the force or pressure needed to drive or make a electron flow which is current. Voltage is also called as electromotive force which is the quantitative expression of the potential difference in charge between two points in an electric field.

                               According to ohm`s law while considering the negligible resistance voltage is directly propotional to the current. So a voltage between two ends determines the amount of current flow in between that two ends.
                               Let us discuss the concept of voltage by a small example assumption.  Let us consider a overhead water tank and the outlets in the street, once the gate valve of the main line is opened the water rushes to the outlets in the streets due to the action of gravitational force.  From this example if the current is the water the voltage is the gravitational force, which creates a potential difference.  So without voltage electrons wont flow and current will not flow either charges are accumulated at the same place until a difference is created between two ends of the conductor.
                              In our electrical systems, voltage is measured against the earth, which is at zero potential.  In other words , the voltage all starts with the ground under our feet.  If there is a potential at a point there will always be a voltage since the ground or earth acts as a zero potential surface.
                               Long distance power lines carry huge voltages, from around 155,000 to 765,000 volts.  If you hooked your washing machine upto that kindof power, you would melt the washing machine instantly-and possibly yourself as well.  The transformers are used to increase or decrease the voltage depending of the turns of the secondary coil with respect to the primary coil.  A few hundred thousand volts might sound like fun to your kids but you should be thankful to the transmission systems which we end up with a lot less voltage, thanks to the transformers.

                              The term voltage`s unit is measured as volts, which is named after the famous physician ALESSANDRO VOLTA.

                            Our government supplies our home with a splitphase 240 volt feed.  This means that two hot wires coming into our service panel, in which each are carrying 120 volts.  This provides power for major appliances such as electric stoves that require both 240 and 120volts.  Just a fact that everything in our house only require 120volts.
                            Because of voltage drops in our house wiring, these numbers might drop as low as 220 V and 110 V.  Some appliances and other electric items even indicate on their instruction panel that the device can work at a range of 220-240V.

                              Potential difference is defined as the difference between the electric potential between the two ends of the conductor.

                               Electric potential(otherwise called as electrostatic potential) is defined as the total workdone in moving a unit positive charge from infinity to a point without any acceleration.

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