Q: throttle body replaced on 2004 Suzuki Verona

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
what is a throttle body and why must it be replaced instead of cleaning this part?
(1) Answer
it is where the air comes into the motor on the intake.
there is a coating on the parts that do not allow us to use any kind of cleaner. the manufacturer reccomends replacement.