Subset
A subset is a set whose elements are all elements of another set, known as the superset or parent set, and is a fundamental concept in Set theory. In other words, if every element of set A is also an element of set B, then A is a subset of B. This concept is crucial in various fields, including Mathematics, Computer science, and Logic. Subsets can be used to define Parameter (programming) boundaries, restrict Domain (mathematics) ranges, and analyze Data structure relationships. The concept of subsets is also related to Self-similarity and Fractal geometry, where a subset of a shape can be similar to the entire shape.