An agricultural attaché is a person who helps farmers and farming businesses. Think of them as helpers for farmers who work in another country. They make sure that farmers and businesses know the rules and regulations of the country they are working in. They also help companies and farmers learn about new farming techniques and technologies. Like a teacher, they educate people on how to be better farmers.
They work for their country's government and are usually posted in embassies all over the world. They are there to help their country's businesses and farmers understand the laws and regulations of the country they are doing business in. This can be very helpful, especially if the rules are different than in their home country.
So, in a nutshell, agricultural attachés are helpers for farmers and businesses who work in other countries. They help to make sure everything is done the right way, and they also teach people new things to help them be better at their job!