Mass-based political parties are political organizations that seek to represent and mobilize large segments of the population, often characterized by their broad membership and grassroots participation. These parties emerged in the 19th century, largely in response to social reform movements, as they aimed to address the needs and interests of diverse social groups, including workers, women, and the middle class. Their rise marked a significant shift in political dynamics, moving away from elite-driven politics toward more inclusive and democratic participation.