Conversion tracking tells you which Facebook ads produce real business results instead of just clicks or impressions. When you track conversions through the Meta Pixel or Conversions API, you see exactly which campaign, ad set, and creative drove each purchase, form submission, or phone call. That visibility lets you kill underperforming ads in days instead of months and pour budget into the winners. The financial impact is immediate. We've seen clients cut cost-per-acquisition by 40–60% in the first month just by identifying which audiences and placements actually convert versus which ones generate junk traffic. Facebook's algorithm also needs conversion data to optimize delivery. If you only optimize for link clicks, the system serves your ads to people who click anything but rarely buy. Feed it conversion events and it finds buyers. Conversion tracking also reveals the customer journey. You might discover that carousel ads drive purchases while video ads generate leads that close later. Or that mobile users browse but desktop users buy. Without tracking, you'd assume the last-click ad deserves all credit and miss the assist from earlier touchpoints. At Ottawa SEO, we set up conversion tracking through both the Meta Pixel and server-side Conversions API because browser-based tracking alone misses 20–30% of events due to iOS privacy restrictions and ad blockers. The API route captures server-confirmed purchases that the Pixel can't see. The tradeoff is setup complexity. You need developer access to install tracking code, and you must define what counts as a conversion for your business. E-commerce is straightforward, but lead gen requires mapping form submissions or CRM entries back to specific ads. Budget $500–2,000 for proper implementation if you're handling it internally, more if you need agency help. Skip it and you're essentially donating money to Meta while guessing which ads work.