A tree is a nonlinear structure in which elements are organized into a hierarchy.
A tree is a nonlinear data structure, compared to arrays, linked lists, stacks and queues which are linear data structures. A tree can be empty with no nodes or a tree is a structure consisting of one node called the root and zero or one or more subtrees. Nonlinear structure is a form of data structure where the data elements don't stay arranged linearly or sequentially. Since the data structure is non-linear, it does not involve a single level. Therefore, a user can't traverse all of its elements in a single run. A non-linear data structure is also another type of data structure in which the data elements are not arranged in a contiguous manner.
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