Short answer
Most interview questions are testing one thing: whether you have actually done the work or only read about it. Answer with specifics from campaigns you ran — numbers, decisions, what went wrong — and you separate yourself from most candidates immediately.
General questions
- "What is digital marketing?" — They are checking you can explain it simply. Do not recite a definition — describe the channels and how they connect to revenue.
- "Which channel would you pick with a small budget?" — Testing judgement. The right answer starts with "it depends on whether people are already searching for this" — search captures demand, social creates it.
- "How do you measure success?" — They want business metrics — leads, cost per acquisition, ROAS — not vanity metrics like impressions or followers.
SEO questions
- "What is the difference between on-page and off-page SEO?" — On-page is what you control on the site; off-page is authority earned elsewhere, mostly backlinks.
- "A client's traffic dropped 40% last month. What do you check?" — The best question on this list. Walk through it: algorithm update, indexing issues, technical changes, lost backlinks, seasonality, tracking breakage.
- "How long does SEO take?" — Three to six months for meaningful movement. Anyone who says 30 days is either lying or targeting keywords nobody searches.
Paid ads questions
- "What is ROAS and what is a good number?" — Revenue ÷ ad spend. "Good" depends entirely on margin — 2x can be profitable at 70% margins and ruinous at 20%.
- "Your campaign has high CTR but no conversions. What is wrong?" — The ad is working; the landing page or offer is not. Check message match, page speed, form friction and audience quality.