Hello, if I want to go to Italy, I need a business visa. How do you explain to the people in Italy that you want them to help out with the invitation letter?

It depends on your own cooperative relationship. If you are relatives and friends there, you will go there in the name of visiting relatives; if you are traveling, you will go there in the name of tourism; if you are in business, you will only need an invitation letter issued in the name of the relevant company.

The business invitation letter is just a letter from the corresponding company and stamped with their official seal, just like the one we invite foreigners to.