Your channel mix is the blend of marketing channels you use to reach customers. That could include paid search, social, email, SEO, display, affiliates, and more. The exact mix looks different for every brand because it depends on your goals, your budget, and where your audience spends time.
A healthy channel mix spreads risk and creates more touchpoints with customers. If you rely too heavily on one channel, you can miss out on growth or be caught out if performance drops. When the mix is balanced, each channel supports the others and the whole strategy works harder.