Search volume is the average number of times people type a specific keyword into a search engine over a set period, most often reported as a monthly figure. It tells you how much demand exists for a topic and helps you decide which keywords are worth pursuing.
Volume figures are estimates, not exact counts. Google's own Keyword Planner reports broad ranges (for example, 10K–100K) and lumps close variants together. Third-party tools like Ahrefs, Semrush, and Serpstat model their numbers from clickstream data and Planner ranges, which is why the same keyword can read 8,100 in one tool and 6,600 in another. Most figures are also a rolling 12-month average, so a seasonal term such as "tax software" looks flat even though it spikes every spring.
A big number is tempting, but it rarely tells you what a keyword is worth. Compare two queries for a bike shop: "electric bike" pulls roughly 165,000 searches a month nationally, while "electric bike tune-up near me" pulls maybe 320. The first is mostly browsers and researchers; the second is someone ready to book. Weigh volume against intent, competition, and conversion potential before you commit.
Search volume is one input into keyword research and prioritization, not the whole decision. Pair it with a clear read on each keyword's intent to build a target list that actually drives revenue.