集合 (Collection) is a fundamental concept in mathematics that refers to a group of distinct objects considered as a single entity. These objects, known as elements or members, can be anything, such as numbers, letters, or even other collections. Collections are often represented using curly braces, for example, 1, 2, 3 represents a collection of the numbers 1, 2, and 3. In set theory, which is the branch of mathematics that studies collections, operations can be performed on collections, such as union, intersection, and difference. Collections can be finite, like apple, banana, cherry, or infinite, like the collection of all natural numbers 1, 2, 3, .... Understanding collections is essential for various fields, including computer science, statistics, and logic.