Magento considers a cart abandoned when a customer adds items to their cart but leaves the website without completing the purchase after a set period. This time limit is usually configurable in the Magento Admin Panel, where you can specify the duration after which a cart is considered abandoned.

In Magento 2, you can adjust this setting under Stores > Configuration > Sales > Abandoned Carts. From there, set the "Abandoned Cart Email" feature to enable automated follow-ups at defined intervals. Configuring this helps businesses reconnect with customers that encourages them to complete their purchases and increases conversions.