[zgohr]

Basically. One thing to consider is the fact that decoupling applications and services they interact with is generally considered a good practice. What services does a web application need? Generally speaking, a web process to handle requests, a database, and maybe some in-memory storage such as memcache. What docker can do is script the creation of these services as containers that can be deployed "anywhere." So say you have your web app now, and your 3 services are on a single server and the load is getting heavy because of database queries. Docker makes it extremely easy to reliably move the services between servers to handle the load better.

Albeit this is a very simplified vision, I don't think the complete use cases for docker have been hashed out quite yet. tl;dr dev ops is about to get magnitudes easier.