A critical functionality in an application are the most important features and the application is useless without these features. Let's take an example for eCommerce Application. Critical functionality for an eCommerce Application. Product Catalog - Displaying products with descriptions, images, prices, and availability. Shopping Cart - Allowing users to add, update, or remove items and view their total purchase amount Checkout Process - Allowing User to place Orders, Complete Payments, Add shipping and billing address. Payment Gateway - Processing payments securely through various methods like credit/debit cards, digital wallets, etc. Order management - Allowing User to Track Order, cancel Order, Return and Exchange Order

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