Have you ever wanted to use 1 line of code that can do all the wonders of hacking for you, eg. entering the remote computer in your network without the target knowing? Or remotely install a program into the computer and start running that program without their consent? Wondering which exploit exists in Metasploit that is similar to the vulnerability you have found using Nessus?
Enter the world of combination between Metasploit and Nessus. By linking both of them together, you can now run a simple code in Metasploit to do both of it at the same time!