Final answer:
An irrational number is a number that continues forever with no discernable pattern. Examples of irrational numbers include π (pi), √2 (the square root of 2), and e (the base of the natural logarithm).
Step-by-step explanation:
In mathematics, a number that continues forever with no discernable pattern is called an irrational number. Irrational numbers cannot be expressed as a simple fraction and their decimal representation goes on indefinitely without repeating.
Examples of irrational numbers include π (pi), √2 (the square root of 2), and e (the base of the natural logarithm).