If the charges come in contact with a conductor such as a piece of metal, the negatively charged electrons travel through the conductor to neutralize any collection of positive charges. It is confusing, but once a convention is made, it is difficult to correct it. You can create the charges necessary for DC electricity with static electricity, but unfortunately, static electricity is unreliable and sporadic. Batteries are a better source of DC electricity. Also, the amount of current created from a battery is much greater than that from static electricity.
Batteries use chemical energy to create the electrical potential.
You can also create electricity with a DC generator, which consists of coils of wire spinning between North and South magnets. The electricity moving through a wire or other conductor consists of its voltage, current and resistance. Voltage is potential energy, current is the amount of electrons flowing through the wire, and resistance is the friction force on the electron flow. A good way to picture DC electricity and to understand the relationship between voltage, current and resistance is to think of the flow of water through a hose, as explained below. A potential or pressure builds up at one end of the wire, due to an excess of negatively charged electrons.