All the citizens aged 18 years and above, regardless of his or her caste, religion or gender can vote in an election. It is known as Universal Adult Franchise.
It is adopted in India due to the following reasons: Different citizens in India differ from one another in many ways; some are rich some are poor; some are highly educated and some are literate; some are kind others are not so. But all of them are human beings with their own needs and views. All of them deserve to have equal say in decisions that affect them.