# Docker Engine

Docker Engine is simply refered to as HOST with Docker installed on it . When we installed Docker then actually we installed three different components:

1\) Docker Dameon : Its a background process that manages Docker objects such as images, containers, volumes & networks.

2\) REST API Service is an interface that programs can use to talk to the Daemon & provide instrcutions. We can cretae our tools using REST API.

3\) Docker CLI is a command line interface that is used to perform actions such as running a container ,stopping containers, destroying images etc.It used REST API to interact with Docker Daemon.

Docker CLI needs not to be necessary on the same host. It could on that another system.

![](/files/-MERv6IXp_yp8tWC4FMX)

Docker uses namespaces to isolate workspace between containers.

![](/files/-MERvWloHwj7HSRPHbGK)

Two processes cannot have same process ID of 1. As we can see below there is no isolation between Container processes & HOST processes. This is where namespace come in to play.

![](/files/-MERw931cjsftvtnngRK)


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