initContainer和Kubernetes中的容器之间的区别

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I noticed in a deployment file there are two fields for containers like initContainers and containers and looks confusing to me and I search through the internet but can't understand. Could anyone please tell me the difference between initContainers and containers and how we use them together?

例如

  containers:
  - name: php
    image: php:7-fpm
    volumeMounts:
    - name: dir
      mountPath: /dir
  initContainers:
  - name: install
    image: busybox
    volumeMounts:
    - name: dir
      mountPath: /dir
    command:
    - wget
    - "-O"
    - "/dir/index.php"
    - https://raw.githubusercontent.com/videofalls/demo/master/index.php

非常感谢，并预先感谢！！