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It goes slower and less reliable than on the direct line, but if the machine is located far from each other, and the data transmitted is not very often, to connect it directly may be inconvenient and too expensive.
Different networks are different ways of connecting machines to each other, the speed with which messages are transmitted, a system where cars are given names, and agreements that, in any form should be a message (for example, the maximum message size, which makes e-mail, or written address whether large or small letters). Agreement on the form of communications and rules of their transfer are called protocols.
In order to send a message from a machine connected to a network, a machine in another network, you need to find an interim machine, connected to both, through which the message and go. Such a machine is called a bridge between these networks. It is clear that between the two networks can be several bridges (but may not be entirely, and then the messaging does not, or he goes through an intermediate network, which is a bridge for both).