What is digital marketing? Digital marketing is promoting and selling products and services, and managing customer relationships, through digital channels: search engines, social media, email, websites and mobile apps. Its core difference from traditional marketing is measurability and targetability: you can see channel by channel whom you reached, what you paid and what you earned.
dentsu forecasts that global ad spend passes $1 trillion for the first time in 2026, with about 69% of it going to digital channels. In other words, most ad budgets are already digital; the real question is not whether to be digital, but how to run the right channels with the right measurement.
What are the channels of digital marketing?
Digital marketing is a system of channels that feed each other rather than a single channel. Some capture existing demand (search), some create demand (social, video) and some maintain the relationship with existing customers (email, CRM).
- SEO (search engine optimization): visibility in organic search results; slow but durable.
- SEM (paid search): search ads such as Google Ads; captures the highest-intent traffic instantly (what is SEM).
- Social media advertising: targeted ads on Meta, TikTok, YouTube, LinkedIn and others; creates demand (social media advertising guide).
- Content marketing: blogs, video and guides that feed both SEO and brand trust.
- Email and CRM: repeat sales to existing customers; one of the lowest-cost channels.
- Programmatic and display: automatically bought ad space on the open web; common for retargeting (programmatic advertising).
- Influencer and affiliate: creators and affiliate programs.
How does the digital marketing funnel work?
Channels do different jobs at different stages of the customer journey. The marketing funnel splits these into awareness (top), consideration (middle) and decision (bottom). Social video and programmatic usually feed the top; search and retargeting feed the bottom. Measuring each stage with its own metrics leads to better decisions than watching a single 'conversions' number (marketing funnel).
Which metrics matter in digital marketing?
Digital's power is measurability, but measuring everything can mean managing nothing. The metrics below are a core set that lets you compare channels in the same language.
- Cost metrics: CPM (cost per thousand impressions), CPC (cost per click), CPL (cost per lead), CPA (cost per acquisition).
- Return metrics: ROAS (return on ad spend), conversion rate, average order value.
- Business metrics: customer acquisition cost (CAC), lifetime value (LTV) and the LTV/CAC ratio (what is LTV).
- Holistic metric: total revenue / total marketing spend; a healthy check independent of platform reports.
See all your digital ad channels on one screen
Ads Sensor combines Google Ads, Meta, TikTok, Criteo and GA4 and compares channels on the same metrics.
How do you build a digital marketing strategy from scratch?
- Turn the goal into a number: not 'grow' but '300 orders a month within six months' or '50 qualified leads a month'.
- Work out unit economics: average order value, margin and acceptable customer acquisition cost.
- Set up measurement first: GA4, conversion tags, server-side APIs and UTM discipline.
- Start with few channels: search if intent is high, social if the product is visual and you can make video; reach learning volume in each.
- Keep refreshing creative and content: algorithms learn from creative; produce new variants regularly.
- Compare channels on the same yardstick: each platform flatters itself in its own report; decide with unified data.
Common mistakes in digital marketing
- Being on every channel at once: budget and attention scatter and no channel reaches learning volume.
- Blindly trusting platform reports: each platform credits its own touchpoints; compare with total revenue.
- Leaving measurement for later: without conversion tracking, automated bidding flies blind.
- Looking only at cheap metrics: a low CPC or CPL can mean low-quality traffic; read it with sales and margin.
Where does Ads Sensor fit in digital marketing?
Ads Sensor brings the paid advertising side of digital marketing into one panel: it combines your Google Ads, Meta, TikTok and Criteo accounts with GA4 and offers cross-platform revenue and ROAS comparison. Its AI analysis reads every campaign, prioritizes risks and opportunities, proposes reasoned actions and applies them through platform APIs with your approval; results of applied recommendations are tracked automatically and 24/7 anomaly monitoring flags problems early. It does not replace SEO, email or content tools; it lets you run your ad channels on one yardstick. Apply for the beta.