[Asafp]

A feature is a data point to your model. it can be as simple as the amount of a transaction (for a fraud detection model) or as complex as the avg_number_of_transactions_in_the_past_7_days_with_over_1k_in_amount_that_were_pending_review. Since you have many features, and they constantly change and evolve and being consumed by many models you need a way to store them - thats how feature stores came to be. I personalty never used.