Definition: Social structure is the organized pattern of social relationships and social institutions that together compose society. Social structures are not immediately visible to the untrained observer, however they are present and affect all dimensions of human experience in society.
Social class is one example of social structure. Social class shapes the access that different groups have to the resources of society and it shapes many interactions that people have with each other. As a social structure, it guides and shapes human behavior at all levels, no matter how overtly visible or invisible it is at any given time.