An example of a service rendered by NIPOST is mail delivery. NIPOST stands for Nigerian Postal Service, and it is responsible for the collection, conveyance, and delivery of mail in Nigeria. This includes letters, parcels, and other items that need to be delivered from one location to another within the country or internationally. NIPOST also provides other services such as philatelic (stamp collecting) products, money transfer, and e-commerce. However, in the context of the question, mail delivery is the service that best fits the description of what NIPOST does.