Final answer:
The majority of the grapes mentioned are used to make fortified wines such as Vins doux Naturels. These sweet fortified wines are produced in hot, dry climates suitable for viticulture, like some areas in southern France and in Brazil's south region. Grafting techniques involving resistant rootstocks are key to protecting the vines from pests like Phylloxera.
Step-by-step explanation:
The grape being referred to is generally used in the production of fortified wines such as Vins doux Naturels, which are sweet wines fortified with spirits to halt fermentation and retain a higher sugar content. This practice is especially prevalent in Southern France and other warm climates that are suitable for growing grapes that produce these types of wines. Fortified wines, including sherry, port, and Madeira, are a significant aspect of wine production in regions well-suited to viticulture, like the warm southern areas mentioned in the question.
In regions like those surrounding the Mediterranean and other areas with hot and dry climates in France, as well as the south of Brazil where Italian immigrants have established vineyards such as the Miolo Vineyard, conditions are suitable for the production of various types of grapes, which can be made into these sweet fortified wines. Additionally, the use of grafting techniques, where European grapevine species that produce superior wine grapes are grafted onto North American rootstocks that are resistant to Phylloxera, an insect pest, has been instrumental in the continued success of wine production globally.