Opt-in marketing requires customer permission before sending promotional messages.

A welcome email introduces a brand to new subscribers after signup.

Lifecycle marketing sends messages based on a customer’s stage in the buying journey.

Targeting helps businesses deliver personalized marketing messages to the right customers.

Segmentation divides customers into smaller groups based on shared characteristics.

ROI stands for Return on Investment, which measures profit compared to marketing costs.

Click-through rate measures how many people clicked a link compared to how many viewed it.