  I will review some of the developments in studies of the host galaxy
properties of Compact Steep Spectrum (CSS) and GigaHertz-Peaked Spectrum (GPS)
radio sources. In contrast to previous reviews structured around observational
technique, I will discuss the host galaxy properties in terms of morphology,
stellar content and warm gas properties and discuss how compact, young
radio-loud AGN are key objects for understanding galaxy evolution.

Astrophysics