What is the definition of middle class in hass (humanities and social science)

The middle class in humanities and social science refers to a socio-economic group that falls between the upper and lower classes in terms of income, education, occupation, and social status. Members of the middle class typically have a moderate level of income and may be employed in professional or skilled jobs. They generally enjoy a comfortable standard of living and have access to resources and opportunities that are not available to those in lower socio-economic groups. The middle class is often seen as the backbone of society, as it is deemed to be the driving force behind economic growth and social stability.