A semigroup is a set of things that is closed under an associative binary operation.
Semigroups are a concept in mathematics and have no emotional connotation.
Examples:
In math, a semigroup is a collection of things that you can combine together in a certain way.
The set of all positive integers forms a semigroup under addition.
A semigroup is like a team where everyone works together and follows the rules.
The operation of addition on the set of natural numbers forms a semigroup.
In a semigroup, when you combine any two things, the result is always in the semigroup.
A semigroup is a special kind of collection where you can always combine two things in the collection in a certain way.