Answer:
Universal Adult Franchise refers to the view that all adults should be given the right to vote. Regardless of their age, race, gender, religion, and ethnicities. These votes should come from their own decision without being influenced by other people (even if its their own family).
Currently, almost all countries in the world granted a Universal Adult Franchise. But, there is some countries that still haven't. For example, women still haven't get the right to vote in Vatican. Due to the religious nature of their country, men still considered the primary leaders of society.
Universal Adult Franchise is needed to make sure that all people could voice up their issues to the government and be taken care of. Not having votes meaning that they can't elect representatives who will fight for their behalf within the government body.