Brutalism in architecture is both an aesthetic and an ideology. Ideologically, it represents the concept that structural components should be made visible. But what does this actually look like in terms of aesthetics? Brutalist architecture is recognizable by the prominence of basic building materials - most notably concrete. In fact, the term 'Brutalism' is actually derived from the French phrase béton burt, which means raw concrete. So, most Brutalist structures will emphasize a solid, unadorned and undecorated flat, concrete exterior.
Expressionism is a modernist movement, initially in poetry and painting, originating in Germany at the beginning of the 20th century. Its typical trait is to present the world solely from a subjective perspective, distorting it radically for emotional effect in order to evoke moods or ideas. Expressionist artists have sought to express the meaning of emotional experience rather than physical reality.
It was a movement that developed in the early twentieth century, mainly in Germany, in reaction to the dehumanizing effect of industrialization and the growth of cities, and that "one of the central means by which expressionism identifies itself as an avant-garde movement, and by which it marks its distance to traditions and the cultural institution as a whole is through its relationship to realism and the dominant conventions of representation. More explicitly, that the expressionists rejected the ideology of realism.