What is engine decarbing? Is this the same as engine cleaning? on 1999 Toyota RAV4

Auto is a 1999 Toyota Rav4 with 47,600 miles

Asked by for the 1999 Toyota RAV4
its a treatment that cleans your injectors,valves and top of pistons along with the thottle body if done properly. it wouldn't hurt the car and may improve performance and mileage