A phytosanitary certificate is like a special passport for plants or plant products that are traveling from one country to another. Just like how people need passports to travel to different countries, plants and plant products need the phytosanitary certificate to travel safely and without any diseases or pests.
This is because different countries have their own rules about what plants or plant products can come in and out of their country. Some countries might have diseases or pests that are harmful to other plants or plant products, and they want to make sure that these things don't come into their country and harm their own plants.
So, a phytosanitary certificate is a certificate that shows that the plants or plant products have been inspected and are free from any pests or diseases. It is like a health check for plants, to make sure they are safe to travel and won't harm any other plants or plant products. The certificate is issued by the government of the country where the plants or plant products came from, and it is checked by the government of the country where they are going to make sure that everything is safe.
In short, a phytosanitary certificate is like a health check for plants that allows them to travel safely from one country to another without causing any harm to other plants or plant products.