Final answer:
A xenograft is a type of skin graft obtained from a foreign donor, such as a pig, used in transplant procedures to replace damaged human tissues.
Step-by-step explanation:
The type of skin graft which comes from a foreign donor, such as a pig, is known as a xenograft. When tissues from animals like pigs are transplanted into humans, it is called a xenograft. The major challenge with a xenograft is the risk of rejection since the recipient's immune system can recognize the donor tissue as foreign, thus triggering an immune response. To resolve this, research into genetic modification of donor animals is being conducted to minimize the immune response. In addition to xenografts, other types of grafts include allografts (from one individual to another within the same species), autografts (from one area of the individual to another), and isografts (between identical twins).