The Fibonacci sequence is a series of numbers where each number is the sum of the two preceding ones, starting from 0 and 1. The sequence begins as 0, 1, 1, 2, 3, 5, 8, 13, and so on. This pattern continues infinitely, creating a unique mathematical relationship. This sequence is named after the Italian mathematician Leonardo of Pisa, known as Fibonacci, who introduced it to the Western world in his 1202 book, Liber Abaci. The Fibonacci sequence appears in various natural phenomena, such as the arrangement of leaves, the branching of trees, and the patterns of certain flowers.