Do you know the difference between synchronous and asynchronous communication?

Synchronous communication is when the sender waits for a response from the receiver before continuing work. For example, when calling an API, the client is blocked until it receives a response.

Asynchronous communication is when the sender does not wait for a response and continues working. The response may arrive later, and its processing occurs separately. This increases system performance and responsiveness.

Example:

• Synchronous: the user clicks a button, the application waits for the server response, and only then updates the interface.
• Asynchronous: the request is sent, the user can continue working, and when the response arrives, the interface updates automatically.

Asynchrony is often implemented through message queues, callbacks, promises, or events.