Share of Voice answers the most basic question in AI visibility: do you even show up? Across a set of category-level prompts. The kinds of questions buyers actually ask an AI. It's the percentage of answers that mention your brand at all.
A high SoV means the engines surface you across more of the category's AI conversation. A low SoV means you're absent from most of it, no matter how strong your product is.
It's a presence metric, not a position one. Being mentioned ninth still counts toward SoV. That's why it's read alongside Top-Ranked % and Average Rank, which capture how prominently you appear when you do. Together they answer "how often, and how high."
Because AI answers shift by phrasing and differ across engines, a reliable SoV reading comes from many prompts, sampled repeatedly, across every engine, not a single spot check.