Conversion tracking in Google Analytics measures when visitors complete actions you've defined as valuable to your business. These conversions are specific goals you set up—checkout completions, contact form submissions, PDF downloads, video views past a certain point, or any other action that moves someone closer to becoming a customer or achieving your site's purpose. You configure conversions in GA4 by marking certain events as conversion events. An event might be "purchase" (tracked automatically for ecommerce sites) or "form_submit" (requires custom setup). Once marked as a conversion, GA4 counts it separately and attributes it back to the traffic source that brought that user in. This lets you see that organic search drove 47 conversions last month while paid ads drove 31, for example. The practical value is connecting marketing spend to outcomes. If you're running Google Ads for a Ottawa law firm and tracking consultation request forms as conversions, you can see your cost-per-conversion is $85 from branded search but $340 from general personal injury terms. That tells you where to allocate budget. Without conversion tracking, you're just counting visitors, which means nothing if they don't convert. Key things to track as conversions: ecommerce transactions (revenue), lead forms, phone clicks on mobile, account registrations, key page views (like a pricing page for SaaS), and time-on-site thresholds for content sites. Don't mark everything as a conversion—newsletter signups might be worth tracking as events, but if you run a $200/month average sale business, only the actual sale or qualified inquiry should be the conversion. At Ottawa SEO, we set up conversion tracking in the first week of any campaign because you can't optimize what you don't measure. We typically see clients who never configured it making decisions on sessions and bounce rate, which is like judging a sales team by how many people they talked to instead of how many deals they closed. GA4 also supports conversion values, so a $500 service inquiry counts differently than a $50 product sale, giving you actual ROI data per channel.