## TL;DR
Marketing creates, communicates, and delivers value to customers. The 4Ps framework guides strategy; consumer psychology explains why people buy; digital channels enable data-driven targeting at unprecedented scale.

## Core Explanation
Strategic marketing: segmentation (dividing markets), targeting (selecting segments), positioning (brand image relative to competitors). Consumer behavior: motivation, perception, learning, attitudes, social influence. The conversion funnel: awareness → consideration → purchase → loyalty.

## Detailed Analysis
Digital marketing channels: search (SEO/SEM), social media, email, content marketing, affiliate, influencer. Metrics: CAC (customer acquisition cost), LTV (lifetime value), conversion rate, ROAS (return on ad spend). The LTV/CAC ratio >3 signals a healthy business model.

## Further Reading
- HubSpot Academy (free marketing courses)
- American Marketing Association
- Nielsen Marketing Research