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Ackerman steering and Parallel steering are how the linkage in the car run. For Ackerman steering they form a trapezoid, but for parallel steering the linkage run parallel to each other. Ackerman steering produces smaller angles, so this helps with parking and maneuvering in small places.

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People have developed autonomous parallel parking robots, although people cannot get into these robots, and drive them in the streets they can learn from them, because it give people a birds eye view of how to parallel park. This helps people understand how they need to turn the wheals and what maneuvers they need to do to successfully parallel park.
http://embedded-lab.com/blog/autonomous-parallel-parking-car/

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Are cars that are engineered to be able to park by themselves . You are in the drivers seat, and you can drive normally, but when you have to park in a tight spot, or in a spot you are uncomfortable with, then you can let the car park itself, without any stress.

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This is a step-by-step manual on how to seer your car while parallel parking.
https://lifehacker.com/the-right-way-to-parallel-park-step-by-step-1461902768

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People have developed robots/machines that will park the car for you, almost like robotic valet.

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Parallel Parking is the act of parking a vehicle along or parallel to the side of the road. Many people believe that parallel parking is very difficult, and is the most stressful part of driving.