What Is a Marketing Funnel? TOFU, MOFU, BOFU Explained for 2026

Every buyer goes through the same broad steps: noticing a problem, looking at options, choosing one. A marketing funnel turns those steps into a plan, so that you know what to publish, where people are lost and which actions bring revenue. This guide covers the stages, the content and metrics for each, the link with search intent and what changes when buyers ask ChatGPT or Gemini instead of browsing ten sites.

What is a marketing funnel?

A marketing funnel is a visual model of the customer journey: many people enter at the top, fewer move to consideration and a small share become customers. The shape is a funnel because each stage loses part of the audience, and the job of marketing is to bring the right people in and lose fewer of them on the way.

The idea goes back to the AIDA model (attention, interest, desire, action), usually attributed to the advertiser E. St. Elmo Lewis at the end of the 19th century. Modern versions keep the logic and adapt the stages to digital channels, where most of the journey happens on search engines, social networks, review sites and now AI assistants.

The funnel is a simplification. Real journeys loop back and skip steps, and B2B purchases involve several people. Its value lies in planning: it shows whether you have content and offers for each level of awareness, and it gives you a place to measure drop-offs.

What are the stages of a marketing funnel?

The standard funnel has three stages, top, middle and bottom, and most teams add a post-purchase stage for retention and advocacy. The table summarizes what happens at each one.

Some models split the funnel further (awareness, interest, evaluation, purchase, loyalty), or replace it with a loop or a flywheel where happy customers feed the top. The names change; the principle of matching content to the level of awareness stays.

What content works at each stage of the funnel?

Top of funnel content teaches, middle of funnel content helps compare, and bottom of funnel content removes the last doubts before buying. Mixing them up is the most common mistake: a sales pitch inside a beginner guide pushes readers away, and a vague blog post on a pricing query loses a ready buyer.

• Top of funnel: answer the questions people type before they know your category. Educational articles, glossaries, data studies and how-to guides bring reach. Add a light next step, such as a related guide or a newsletter.
• Middle of funnel: show the options honestly. Comparison tables, buyer guides, use cases by profile and free tools let prospects evaluate, and position your offer among the alternatives.
• Bottom of funnel: make the decision easy. Clear landing pages, transparent pricing, proof (reviews, results), FAQs on objections and a low-risk way to start, such as a trial or a demo.
• Retention: help customers succeed with documentation, onboarding emails and updates, which also produces material for referrals and reviews.

This content-first approach is the core of inbound marketing: attract people with useful content at the top, then guide them down with relevant offers.

How does the funnel relate to search intent?

Each funnel stage corresponds to a type of search intent, so your keyword research is also a map of the funnel. Looking at the words people use tells you how close they are to buying.

Matching the page format to the search intent is also what Google rewards: a query like "best CRM for small business" shows lists and comparisons, while "CRM definition" shows explanations. If your page type differs from what ranks, it will struggle whatever its quality. Bottom of funnel queries have lower volumes but convert far better, which is why a balanced content plan covers all three levels instead of chasing traffic at the top only.

Which metrics should you track at each stage?

Measure reach at the top, engagement and lead capture in the middle, and conversions and revenue at the bottom, then follow the conversion rate between stages. The transitions often teach more than the absolute numbers.

• Top: impressions, organic visits, new users, share of non-branded traffic, citations in AI answers.
• Middle: engagement rate, visits to comparison and product pages, newsletter sign-ups, downloads, returning visitors.
• Bottom: trial or demo requests, purchases, conversion rate, cost per acquisition, revenue.
• Retention: churn, repeat purchases, customer lifetime value, reviews and referrals.

Compute the rate from one stage to the next to find the weakest point: if many visitors read your guides but few reach a product page, the internal links and calls to action between the two are the problem. The free conversion rate calculator helps for quick checks, and our guide to SEO KPIs details which indicators to report.

How are AI assistants changing the marketing funnel?

AI assistants compress the funnel: a buyer can go from "what is this problem" to "which three providers should I consider" in a single conversation, without visiting your site. The stages still exist, but some happen inside ChatGPT, Gemini, Perplexity, Claude or Google's AI Overviews.

Three consequences follow. First, top of funnel clicks can fall while impressions stay stable, because the answer is given on the results page; this is the rise of zero-click searches. Second, the shortlist is often built by the assistant, so being cited as a source or recommended by name becomes a middle of funnel goal in itself. Third, visitors who do click arrive later in their journey and better informed, which tends to make bottom of funnel pages more important.

To stay present, publish clear answers that an assistant can quote, keep facts about your offer consistent across your site and third-party pages, and track the prompts your buyers ask to see whether your brand appears and who appears instead.

How do you build a marketing funnel step by step?

Start from the customer, map the questions at each stage, fill the gaps with content and offers, then measure the transitions.

1. Define the buyer: their problem, their objections and the moment they usually decide.
2. List the questions per stage with keyword research and conversations with sales or support.
3. Audit existing content and place each page in a stage; most sites have too much top or too much bottom.
4. Create the missing pieces, starting with the bottom of funnel pages closest to revenue, then the comparisons, then the educational content.
5. Link the stages with internal links and calls to action suited to each level of awareness.
6. Measure and adjust every month, focusing on the stage with the biggest drop.

Conclusion

A marketing funnel is a simple way to plan content and measure where prospects drop off: teach at the top, help compare in the middle, make the decision easy at the bottom, and keep customers after the sale. Map each stage to search intent, track the transitions rather than vanity totals, and make sure your brand is present in the AI answers that now cover several stages at once.

Sorank fills the top and middle of the funnel on autopilot: it finds the keywords at each stage, writes and publishes one article a day with internal links, and tracks every week whether the AIs cite your brand on the prompts your buyers ask. See the plans, with a 3-day free trial.