If you are using a hosted server (which I assume almost everyone reading this is), then you will occasionally need access to your server to perform some higher level development work. To do so, the most common tools are telnet and ssh (via a program like putty). These tools allow you to “tunnel” into your server account and perform tasks like manipulating files (change permissions, etc.), accessing cron jobs, running command line instructions (CLI) for relevant programs (e.g., MySQL, PHP), etc. Many webhost companies also offer web-based tools to do many of these same tasks. The most common of these is called cPanel.
Subject: Platform & Development Tools