What is a 301 redirect?
In the simplest of "technical definitions", a 301 redirect is a permanent redirect from one URL to the other. A 301 redirect also is often described as a "change of address form" you might get at a post office. If someone doesn't know you moved, you want to make sure all your mail is forwarded to your new place.
For example, if your previous website was www.awesomewebsite.com
and you wanted to change it to www.reallyawesomewebsite.com
, you'd implement a 301 redirect from the old URL to the new one. Now whoever typed in your old URL (or clicked on a leftover link to your old URL), would automatically appear at your new URL.
Hope this helps,