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Movies would have people believe that the jets are there to shoot down the errant jet. During the Cold War, this was entirely plausible and did happen. But more commonly, when a fighter jet is sent to intercept an unknown aircraft -- perhaps one that has entered restricted or prohibited airspace -- it may be just to have eyes on the situation.
Airspace is huge. The vastness of the air is like the vastness of the sea. Sometimes it's an advantage because there's fewer things to hit. But on the flip side, if an aircraft needs assistance, there might not be anyone for many miles in any direction. As for what an assisting fighter jet can do, the first is to establish navigational accuracy. History has shown that airplanes can get lost, and sometimes unfortunately end up hitting mountains or running into known obstacles or weather. A second aircraft can confirm the first aircraft's position, since two separate aircraft having navigational problems is exceptionally rare.
The next thing is having eyes on the outside of the aircraft. Things like a damaged engine on a jetliner aren't visible to the pilots, but there's a chance the passengers or cabin crew can look. But damage to a rudder is impossible to see from inside the aircraft; I'm not yet aware of a commercial aircraft equipped with a tail-viewing camera. Checking the condition of the landing gear is also valuable information, if a jetliner has taken damage but still aloft.
Finally, if it should come to it, an assisting aircraft can be the pilot's eyes, if for some reason the pilots can no longer see out their windscreen. At this point, the flight may already be close to the end but it may help avoid additional casualties on the ground. I'm reminded of the flight where volcanic ash sandblasted the windshield, or when a cargo jet had a fire onboard which filled the cockpit with thick smoke.
To be clear, neither incident was aided by fighter jets, but having an external set of eyes to give directions would have made things a little bit easier for the pilots. Other aircraft besides fighter jets can provide assistance, such as any helicopters or private pilots in the area. But of course, fighter jets are on-standby and can get to a scene very fast.