Global citation refers to the citation of a source that is recognized and can be accessed worldwide, independent of the region or country, usually published in international journals or databases. It enhances the visibility and accessibility of the work on a global scale. On the other hand, local citation specifically refers to the citation of a source within a particular area or region. These sources may include local journals, databases, or publications which may not be easily accessible or well-known outside of that region. Thus, the key difference lies in the geographic coverage, with global citations catering to a worldwide audience, and local citations being more regionally focused.