An email alert is a notification email that is automatically triggered and sent to an individual or group of recipients when a series of predefined conditions are met. For example, a stock portfolio tracking service could notify users, upon request, that a stock has reached a certain price threshold. This type of notification can also be used in promotional campaigns to inform certain logged-in customers of special offers available for a limited time.

An email alert service involves automatically sending an email in response to a specific user request. This request can relate to various events, such as a birthday, product availability, or reaching a certain price point. Email alerts are widely used in diverse sectors, including real estate, job postings, banking, and online sales platforms, to inform users about product availability. For example, an email alert service can notify a user as soon as a selected product goes on sale.