This essay provides definitions and discussions of several key terms in sociology to help understand the social world. The essay begins by defining quantitative and qualitative research methods, highlighting their roles in gathering and analyzing data to understand social issues. It then explores the concept of alienation, explaining its philosophical and sociological dimensions, including social isolation and its causes within modern society. The essay continues by differentiating between mechanical and organic solidarity, emphasizing the different forms of social integration in various societies. Finally, it discusses the terms health and well-being, highlighting their importance in understanding individual fitness, mental stability, and the overall health of society. The essay uses references to support the definitions and discussions of the key terms.