They are automated reminders sent to customers who leave items in their cart without completing a purchase.

Shopify Messaging allows merchants to send email and SMS campaigns to customers.

Shopify Forms helps merchants collect customer emails and build subscriber lists.

Marketing automations are workflows that automatically send messages or actions based on customer behavior.

Multichannel marketing means promoting products across multiple channels such as email, social media, and paid ads.

A marketing campaign is a group of marketing activities organized around a specific business goal.

You can manage campaigns from the Marketing section in the Shopify admin.