First, the manual deployment
Second, the automatic deployment
"Automation" a concrete manifestation: After submitting new code to the repository, automatically deployed on the application server immediately is the latest application users or testers use.
Continuous integration environment can be built above the entire build, deploy process automation, to a large extent reduce the workload. For the daily development programmers who will not cause any extra burden - the code submitted up after themselves, running on the server immediately it is the latest version - in virtually all happened.