A keyword research tool is software that reveals what people actually search for on Google and other search engines, plus data that helps you decide which keywords to pursue. The core metrics most tools provide include monthly search volume (how many searches per month), keyword difficulty or competition scores (how hard it is to rank), and cost-per-click data from paid ads (which signals commercial intent). These tools pull data from search engine APIs, clickstream data from browser extensions, or their own proprietary databases. Popular options include Google Keyword Planner (free but requires an Ads account), Ahrefs, SEMrush, and Moz Keyword Explorer. Free alternatives like Ubersuggest or AnswerThePublic work for basic research but have limited data depth. What makes keyword research tools valuable is they surface questions and phrases you wouldn't think of on your own. You might know your industry uses "commercial roofing," but a tool shows you that "flat roof repair cost Ottawa" gets 320 searches monthly with lower competition. That's the kind of insight that shapes content calendars. Most tools also show related keywords, search trends over time, and what's ranking now for each term. At Ottawa SEO, we typically cross-reference 2-3 tools because no single source has perfect data. Google Search Console remains the gold standard for what actually drives traffic to your site, but it only shows keywords you already rank for. The main limitation is that tools estimate search volume and difficulty—they're directional, not exact. A keyword showing 500 monthly searches might actually get 300 or 800 depending on seasonality and how Google interprets intent. Competition scores vary wildly between platforms because each uses different algorithms. For local businesses in Ottawa or Toronto, keyword tools often underreport search volume because they aggregate data nationally or globally. A term might show 50 searches but actually matters in your local market. That's where you combine tool data with Search Console insights and basic common sense about what your customers ask during sales calls.