What is a Ferrite Rod Antenna?

Had a look at the ferrite rod antenna inside a new multi-band pocket radio which I bought recently. Looks similar to the older ones which I had seen in my childhood. One difference which I noted was that the ferrite had a long cuboidal shape rather than the long cylindrical shape which I had seen as a child. Anyway, glad to know that the ferrite rod has 'survived' in spite of so much advancement in technology over half a century!

Видео What is a Ferrite Rod Antenna? канала Johnson's TechWorld