There is a simple answer to this complex question. No.
Children don’t need preschool to gain admission to kindergarten or to succeed in life. In fact, the wrong preschool experience could potentially set a child back by creating a negative perception of school, learning, and socializing. However the right preschool experience can give a child a headstart academically and socially over peers without preschool.
In order to make the right choice for your child you need to look at what a preschool program should do for children. Ideally, preschool should help integrate children socially so they learn about the rules and structures of society in general and school society in particular. In addition, preschool helps students begin a foundation of academic knowledge including literacy, numbers, and culture.
The actual content, focus, and structure of preschool programs varies widely from community to community (and often even within communities) but most programs achieve these two primary goals for students. However a parent can easily accomplish similar goals without the confines of a specific preschool program.
Obviously many families need to...