A telescopic steering column is a part which allows adjustments to the steering wheel to tilt towards or away from the driver for personal comfort and ease of use. This allows the driver to experience less discomfort while using a vehicle not suited to his height or proportions.
The steering column is the piece that attaches the steering wheel to the internal steering mechanism of the vehicle. Without the steering column, the steering wheel's movements do not transfer into a change in the angle of the vehicle's primary turning system, such as the wheels of a car or the rudder of a boat. A telescopic steering column is a tubular steering column which slides up and down within itself to contract and expand. The purpose of this is primarily comfort, although some telescopic steering columns also serve a safety function in keeping the driver in the appropriate position when the airbag deploys.
Most modern cars have telescoping steering columns. Like adjustable seats, telescopic steering columns are either powered by the car or adjusted entirely by the user's hand. Some steering columns also often include a steering lock that prevents the car's wheels from turning when the key is not in the ignition.