Hair weave in general are machine wefted hair where one end of the hair (head part) is drawn and feed into machines. https://shop.vakahair.com/collections/hair-weave
This is used all around the world as the most preferred hair extensions. It's also called as hair bundles and to be precise human hair bundles are the highest quality hair bundles and the cheap ones are made from synthetic hair as well. With regard to natural human hair bundles, Indian hair is mostly used for manufacturing hair weave. Indian hair as described in this story has two different types - one is the temple hair which is the highest grade of human hair sourced from Indian temples through legal auctions. Due to the complexity and steep pricing, this hair is almost a rare find. Even if found, it will be mixed with cheap hair as fillers. The second category is the cheap balled hair collected from Indian villages which is then processed to make finished hair extensions. Wefts are again done using different methods. The earlier one is the hand tied which is now extinct and the latest ones are machine wefted which are more robust than their predecessors.