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Because the metal in the wire is a conductor of electricity. The metal in wires is Cu (copper).

As it was told to me in my young apprentice days; all things are made up of atoms, all atoms, have electrons flowing around them, the number of electrons is determined on the element we are dealing with. Copper, for instance has 29 electrons flowing around in 4 fields, the outer field, IE furthest away from the centre has only one lone electron, which is very unstable due to its distance away from the nucleus (most, if not all good conductors of electricity such as platinum, gold, silver, and copper seem to have only one electron on its outer field).

Now, because that lone electron is so unstable, it is easy to push it on to another atom, but the next atom in the chain already has its 29 electrons and it just can't have 30. As Mr Scott would say "Ye canny change the laws of physics Jim", and he was right. So, it in turn has to get rid of the extra electron by push one of its own onto the next atom, and so on down the cable, producing a chain reaction which we call an electric current.

In theory, electricity actually flows from negative to positive, we got it back to front in the early days of discovery, but that's only a theory, the red (or brown) wire is the one that kicks.

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Answer #2:

A potential difference (voltage) between the ends of the wire does.

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