Full definition
ROI = (profit − cost) / cost × 100%. For example: you invest $1,000 and earn $5,000 back — that's a 400% ROI. It's the single most important marketing metric: a positive ROI means keep going, a negative one means stop.
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TL;DR — In one line
How much you got back for every dollar you invested
More terms in General Digital Marketing
CTR (Click-Through Rate)
The percentage of impressions that result in a click
CTA (Call To Action)
A line that invites the reader to take action
Lead
Someone who has shown interest in your product or service
Funnel (Marketing Funnel)
The journey from "awareness" to "paying customer"
Brand Awareness
How many people recognize your brand
Copywriting
The art of persuasive marketing writing
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