A grassroots movement is a social or political movement that originates from a small group of individuals and gradually spreads to create a larger movement. The term "grassroots" refers to a type of movement that is driven by ordinary citizens rather than established institutions or political parties. Synonyms for grassroots movement include citizen-led movement, people-powered movement, bottom-up movement, community-driven movement, and local activism. These movements can occur at the regional, national, or even international level, and they are often fueled by a shared passion or concern that unites people from diverse backgrounds in a common cause.