In the direct current there is a fixed plus pole and a fixed minus pole. The current flows between these two poles, i.e. the electrons move from the minus pole to the plus pole.
Direct current is widely used in the household sector, e.g. in computers, audio and video equipment. Nevertheless, there is no direct current from the socket.
Much more each device is supplied individually from a power supply.
Direct current is generated to a considerable extent by rectifiers from alternating current. There are also various energy sources that supply direct current to a connected load, such as solar cells.