IB Physics Centrifugal force?

A tutorial sheet on “centrifugal force”. Is this a “real” force? Some usages of this term are taken from well known textbooks. What do the author/s mean?

  1. Space Frontier , 1971 by Wernher von Braun, page 49. A circular orbit occurs whenever a small mass travelling through the gravitational field of a big one, happens to have a speed at which the centrifugal force is precisely strong enough to balance the large body's gravitational pull.