Vaccination is an example of artificially acquired active immunity in which inactivated or killed antigens are injected in the body to initiate an immune response and form memory cells against that antigens so that on the subsequent encounter with that antigen, the secondary response against it is generated.
Colostrum and antivenom are examples of passive immunity.
Antivenoms are made by injecting venom into the animals. The antibodies produced in the animal body are collected and given to the patients of snake bite.
Colostrum is the first form of dark yellow colored thick milk produced by the mother after delivery of the newborn.
Immunity acquired by a person after measles is an example of natural active immunity. The immune system of the person has developed memory cells that will helps the individual immunity against the disease.