"Social Realism" is the depiction of intricate socio-economic issues, such as unemployment and economic troubles, as well as social and racial injustice. The scenes of these types of film often have an influence of political protest, and are edged with satire.
Social Realism films often take a nitty-gritty view on life's trials and tribulations, and often depict the working class protagonist as the hero characted.
Social Realsim films are also often created to depict the themes that other genres of film may not, including (but not limited to) prostitution, abortion, relationship problems, drug use, the list goes on...
Films such as "This Is England" are fantastic examples of a social realism films, because of the harshness in which it is made. It depicts the culture of "Skinheads" in the 1980's, and how tough it was for some, to grow up in the 1980's.