This guide will help you to understand

Overview of recommendations use-case

Objective	Use-case (links)	E-Commerce Goal	Ideal Models / Templates
Product Discovery	New Products on Stock	Activation, Repeated Purchases	New items
	Alternative Products (based on items)	Activation, Repeated Purchases	Textual similarity, More like this
	Alternative Products (based on customers)	Activation, Repeated Purchases	Product Detail
	Most Popular Products	Activation, Repeated Purchases	Popular right now
	Browse Abandonment	Repeated Purchases	Customer recent interactions or Personalised recommendations for you
	Top Products from Category	Activation, Repeated Purchases	Metric based category
	Alternative Products (based on filter)	Activation, Repeated Purchases	Filter based category
Personalised Experience	Personalised Product Recommendations	Repeated Purchases	Personalised recommendations for you and Customer recent interactions
	Retention Campaign	Repeated Purchases	Personalised recommendations for you
	Top Products from Favourite Categories	Activation, Repeated Purchases	Metric based category
	Personalized Products from Category	Repeated Purchases	Personalized category page
Up-sell and cross-sell	More Expensive Alternatives	Higher Order Value	Textual similarity
	Complementary Products	Higher Order Value	Customers who bought this item also bought
	Complementary Products after Order	Higher Order Value	Customers who bought this item also bought

For reference on the individual models mean see Product Recommendation Templates