Plugins are readily available software that has been released by third parties and been approved by Metasploit. These plugins makes pentesters life easier, like msfconsole.
Using Plugins
To start using plugins, we can navigate /usr/share/metaplsoit-framework/plugins where the default plugins are saved. To load plugins, fire up msfconsole and use load.
msf6 > load nessus
[*] Nessus Bridge for Metasploit
[*] Type nessus_help for a command listing
[*] Successfully loaded Plugin: Nessus
msf6 > nessus_help
nessus_connect Connect to a Nessus server
nessus_logout Logout from the Nessus server
<SNIP>And to install new plugins, we would save the .rb file in the default plugin folder mentioned above.
Mixins
The Metasploit Framework is written in Ruby. This plays a big part in what makes msfconsole excellent to use. Mixins are one of these features that, when implemented, offer a large amount of flexibility to both the creator of the script and the user.