What is the precise operation of a lathe's rotating centre tailstock?

A long job is intended to be supported by a lathe centre at its opposite end so that it becomes a simply supported beam rather than a cantilever. Therefore, there is less task deflection and improved machining quality. In most lathes, the task is supported by a dead centre at the tailstock. A dead centre is unmoving. When a work is supported by a dead centre, the centre remains motionless but the job rotates. Therefore, friction generates a lot of heat. There is no issue if the work rotates at a slow speed. High-speed machining, however, can cause a job or centre to melt due to frictional heat.

Revolving centres are therefore utilised to accommodate lengthy projects that are spun at a high rate of speed.  check site :-https://www.mvikas.in/revolving-center-high-speed-extended-point-mt4