Automatic and manual transmissions differ in how gears are shifted. With a manual transmission, the driver shifts gears manually using a clutch, while an automatic transmission shifts gears automatically.
There are advantages and disadvantages to each. Manual transmissions are generally cheaper to maintain and more fuel efficient but require more focus while driving. Automatic transmissions are better for city driving and less experienced drivers but tend to be more expensive initially and to repair.
The best transmission depends on the individual driver - automatic may be preferable for those who prefer a relaxed drive while manual allows for more control and is more affordable to own.