Conversion tracking tells you what happens after someone clicks your ad or visits your site. It records the actions that matter to your business—purchases, lead form submissions, phone calls, email signups, quote requests—and ties them back to the source that brought that visitor. This means you can see that Google Ads campaign X generated 12 sales at $85 each, while Facebook campaign Y generated 40 clicks but zero revenue. Without conversion tracking, you only see surface metrics like sessions and bounce rate. You might celebrate 10,000 visitors from a channel that converts at 0.1%, while ignoring 500 visitors from a channel that converts at 8%. Traffic volume means nothing if it doesn't convert. Conversion tracking shifts your focus from vanity metrics to actual ROI. The technical setup varies by platform. Google Ads and GA4 use tags (formerly called pixels) placed on your thank-you or confirmation pages. Call tracking services like CallRail assign unique phone numbers to different campaigns and log which number rang. E-commerce platforms like Shopify have built-in tracking, but you still need to connect it to your ad accounts to close the attribution loop. At Ottawa SEO, we set up conversion tracking in the first week of any campaign. We define 2–4 primary conversions (usually purchase, lead form, phone call) and separate them from micro-conversions like newsletter signups. This prevents us from optimizing toward low-value actions. We also track conversion value when possible, because a $5,000 B2B lead is worth more than a $50 product sale, even if both count as one conversion. The tradeoff is complexity. Multi-touch attribution gets messy when someone sees your ad, later finds you via organic search, then converts. GA4's data-driven attribution attempts to solve this, but no model is perfect. The key is to pick a consistent attribution method and use it to compare performance over time, not to chase perfect accuracy that doesn't exist.