Automatic transmission: It switches gears without the driver having to do anything.
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Its automatic activation controlled by the vehicle's computer (ECU) generally prioritizes fuel's efficiency. It is very convenient to have one to drive in cities as there are usually traffic jams there.
When I start my car and put gear on drive my car is running on only 1st gear it's not shifting to 2nd gear and then I am powering off my car and I am starting then the gears are shifting normally