What Is a Marketing Funnel? AIDA and TOFU, MOFU, BOFU Explained
A practical guide to the marketing funnel: how AIDA relates to TOFU, MOFU and BOFU, content and metrics for each stage, with a Thai business example.
An online clothing shop spent its full ad budget. Lots of people saw the ads and liked them, but sales barely moved. A closer look at the data showed most viewers were meeting the brand for the first time and weren't ready to buy, yet every ad said only "50% off, today only". The problem wasn't the budget. The message didn't match the stage the customer was in. That is why marketers use the idea of a marketing funnel.
What is a marketing funnel?
A marketing funnel models the customer's journey from not knowing a brand to deciding to buy. It is called a funnel because the number of people shrinks at each stage: many see you, fewer become interested, and fewest buy. Its value is helping you choose messages, channels and metrics that fit each stage, rather than saying the same thing to everyone.
AIDA: seen from the customer's mind
AIDA is a classic model describing four states in the customer's mind.
- Attention: notices the brand or product
- Interest: wants to know more because it relates to their problem
- Desire: feels this product is right and better than alternatives
- Action: acts, for example buys, signs up or makes contact
AIDA is especially useful when writing a single ad or sales page, because it orders the message from the first attention-grabbing line to the call to action button.
TOFU, MOFU, BOFU: seen from the marketing team's work
TOFU (Top of Funnel)
The goal is to get known and start building trust. Fitting content is general knowledge that answers your audience's problems, such as articles, short videos or posts that help without selling directly.
MOFU (Middle of Funnel)
People start comparing options. Fitting content includes in-depth guides, case studies, webinars or comparisons that help decisions, often exchanged for contact details such as an email address or adding your LINE OA.
BOFU (Bottom of Funnel)
People are ready to buy and need a final reason: reviews from real customers, a trial, a promotion with clear terms, or answers about price and delivery.
Put simply, AIDA describes what the customer feels, while TOFU, MOFU and BOFU describe what content the team should create and what to measure. The two work well together.
Don't propose on the first date. A funnel lets customers get to know you one step at a time.
Metrics for each stage
- TOFU: reach, new visitors, branded searches
- MOFU: leads, newsletter sign-up rate, time spent on content pages
- BOFU: conversion rate, cost per sale, average order value
Read the metrics together. If TOFU is strong but MOFU drops, your middle stage content isn't helping people move forward. Read more on choosing metrics in marketing KPIs worth tracking.
Example: a physiotherapy clinic
- TOFU: short videos teaching neck stretches for office workers
- MOFU: a free downloadable guide on which kinds of back pain need a specialist, in exchange for adding the clinic's LINE OA
- BOFU: reviews from patients, clear pricing and an easy booking button
- After purchase: follow up messages on recovery and care advice, encouraging return visits and referrals
Things to watch out for
- Real customer journeys aren't straight lines. Some people skip stages and some loop back. Use the funnel as a map, not a fixed rule.
- Don't forget the post-purchase stage. Satisfied existing customers are often your most cost-effective channel.
- Low-priced products may have a very short funnel, so you don't need equal content at every stage.
How to start
- Write the questions customers ask at each stage, from not knowing you to just before paying
- Match your existing content to each stage and see which stages are empty
- Choose one main metric per stage
- Add content to your weakest stage first, then measure for a month
To build strong TOFU content, read Content Marketing basics, and if you want to learn digital marketing systematically, browse partner courses on the courses page.