deployment

(1) The placement of force elements in battle positions to obtain a higher state of readiness. (2) The movement required to place force elements in battle positions. (3) Fielding the weapons system by placing it into operational use with units in the field/fleet. (4) To arrange, place, or move strategically.

A deployment is a clustered architecture that represents all of the instances (servers) in your application and associates them with each other. As a result you're able to specify global parameters that all of the instances inherit, which makes it really easy to add additional components without the need for extra configuration...