Answer: Personal Digital Assistants
Step-by-step explanation:
Personal Digital Assistants are a range of small handheld mobile devices that used to be very popular with working class people as they provide computing and storage uses which are very important in the business world for purposes such as keeping schedules and address books. They were like mini-computers that had small keyboards and sometimes a sensitive pad that could be written on.
Usually termed the 'first Smartphones', PDAs were immensely popular in the 90s and the early 2000s but have since been largely replaced by Smartphones which can perform all their duties and more.