Simple Definition:

A set is a collection of distinct objects [things that are separate and different from each other]. It is a group that contains elements [individual items] with no specific order or arrangement. Each element in a set is unique, meaning it only appears once. Sets can be made up of any type of object, such as numbers, letters, or even other sets.

For example:

• A set of numbers: {1, 2, 3, 4, 5} [The set contains the numbers 1, 2, 3, 4, and 5]
• A set of letters: {a, b, c, d, e} [The set contains the letters a, b, c, d, and e]
• A set of colors: {red, blue, green} [The set contains the colors red, blue, and green]

Very Simple Definition:

A set is a group of things. It can be made up of numbers, letters, or other stuff. Each thing in a set is special and there is no order.

For example:

• A set of numbers: {1, 2, 3, 4, 5}
• A set of letters: {a, b, c, d, e}
• A set of colors: {red, blue, green}