What does it mean to "deploy" an application?

Deploying an application refers to the process of making the software available for use in a specific environment, typically on a server or within a cloud infrastructure. This involves taking the application, which has already been developed and tested, and transferring it to a live environment where end-users can access and utilize its features. Deployment can include various steps such as configuring the server, ensuring all necessary dependencies are installed, and performing final checks to confirm the application operates correctly.

Making the application available is essential for its practical use, as users can't benefit from the application's functionality until it is deployed. This process may vary in complexity, ranging from a simple manual upload to a comprehensive automated pipeline that ensures efficiency and reliability.

The other aspects of the question, such as developing a prototype, writing tests, or monitoring performance, represent important activities in the software development lifecycle. However, they do not encompass the specific act of deployment, which is focused solely on the readiness and accessibility of the application in a designated environment.