In what cases is the use of a queue justified in your project or development?

A queue is justified in a project when it is necessary to:

• Ensure asynchronous processing of tasks to avoid blocking the main thread (for example, sending emails, processing images).
• Unload the system during peak loads by storing tasks in the queue for sequential processing.
• Guarantee reliable message delivery between system components.
• Organize interaction between microservices, where one service places tasks in the queue and another processes them.

Example: in an online store, when placing an order, a task can be put in the queue to send a notification, so as not to delay the response to the user and to handle email sending separately.