Truffle is a relatively rare species of underground mushroom. We find it at a depth of 6-15 cm below the ground. To "feed", it is attached to the roots of trees or shrubs. This is called "mycorrhizal symbiosis". Conversion is also beneficial for trees because they absorb river, phosphorus, iron and micronutrients from truffles. Truffle absorbs carbohydrates. These trees are called "hosts". The most common are oak, aria, curry and hazelnut.
There are about 100 species of truffle. Not everything is edible. Six species are on the world market. In order of value are: precious white, precious black, autumn black, winter black, white spring and summer black. Each has a different taste and aroma, but the name 'valuable' refers to their rarity.