Question

what is the dialysis

Answer 1

Kidney dialysis is a procedure that is a substitute for many of the normal functions of the kidneys. Dialysis allows patients with kidney failure a chance to live productive lives. There are two types of dialysis: hemodialysis and peritoneal dialysis.
OR
the separation of particles in a liquid on the basis of differences in their ability to pass through a membrane.

Answer 2

Those people whose kidney are not functioning properly will have to use the dialysis machine. This machine act as an artificial kidney to remove the toxic substances in help the person survive