Taking action to support an idea or cause is best described by which term?

The term that best describes taking action to support an idea or cause is "Advocacy." Advocacy encompasses a range of activities aimed at influencing decisions within political, economic, and social systems and institutions. This can involve raising awareness, mobilizing communities, and engaging in dialogue with policymakers to promote change related to a specific issue or cause. Advocacy is driven by a commitment to support particular ideas or causes, and it often aims to empower others through actions such as lobbying, campaigning, and public speaking.

In contrast, media advocacy focuses specifically on using media strategies to influence public opinion and public policy. Social marketing involves applying marketing principles to promote social objectives, often to change behaviors for a social good. Literacy generally pertains to the ability to read and write and does not necessarily imply taking action to support a cause. Thus, "Advocacy" directly aligns with the definition of taking meaningful action to support an idea or cause.