Final answer:
Irrational numbers cannot be expressed as a fraction or ratio of two integers and have decimal representations that go on forever without repeating.
Step-by-step explanation:
Irrational numbers are numbers that cannot be expressed as a fraction or ratio of two integers. They are decimal numbers that go on forever without repeating. Examples of irrational numbers include π, √2, and √3. These numbers cannot be expressed as a simple fraction or as a terminating or repeating decimal.