Parallel parking means parking your car in line with the other cars parallel to the curb

Parallel parking
Parallel parking means parking your car in line with the other cars parallel to the curb, front bumper to rear bumper. Parallel parking usually occurs on the side of streets where there are no parking facilities, because it leaves enough room for the traffic to pass. Parallel parking is a challenge to some people, because it requires a certain technique different than driving right into a parking space:

How to parallel park your car
With parallel parking, you first drive your car next to the car you're parallel parking on. This is the car that is in front of the open parking space you want to park your car. If the car that you’re parallel parking on is the same size, line your right side mirror up with their left side mirror. If the car is bigger, place your car a bit further back. If the other car is smaller, move a bit more towards the front of that car. Then you move back slowly, with the wheel turned towards the curb. At one moment, you turn the wheel away from the curb fast and keep driving backwards slowly. When the back of your seat is aligned with the rear bumper of the car you’re parallel parking on, turn the wheel away from the curb fast while keep moving back slowly. If everything went right, you have parked your car right between the two other cars now and close to the curb. Sometimes you need to adjust your position with moving back- and forward a bit. When parallel parking, you always have to make sure there is enough space left between the other cars and yours so that you’re all able to pull out of the parking space.
Perpendicular parking
Perpendicular car parking means parking the cars side by side, perpendicular to a wall, curb or something else. You see this type of parking mostly in parking bays and garages, because you can park many cars on limited space.
Angle parking

Angle parking is similar to perpendicular parking, except the cars are aligned in an angle. Normally the angle is aligned with the direction cars approach the parking space. It makes it a lot easier to drive into the parking space in contrast to perpendicular parking, where the parking space is at a 90 degree angle. With angle parking there is a gentler turn. Not only is it easier to park, but it’s also faster and the parking spaces are smaller, making it possible to add more parking spaces in the same size area. Normally you see angle paring inside parking garages and on streets that are wide enough to have room left for the traffic to pass.