What is Fibonacci number?
A Fibonacci number is a number in the Fibonacci sequence, which is a sequence of numbers in which each number after the first two is the sum of the two preceding numbers. The first two numbers in the sequence are typically 0 and 1, and the sequence goes on indefinitely, with each number being the sum of the previous two. For example, the first few numbers in the Fibonacci sequence are 0, 1, 1, 2, 3, 5, 8, 13, 21, and 34.

These numbers were first introduced by Leonardo Fibonacci in his book Liber Abaci in 1202, as a solution to a problem involving the growth of a population of rabbits. The Fibonacci sequence has since found applications in mathematics and science, as well as in art and architecture.
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### Instruction:
What is Fibonacci number?

### Response:
A Fibonacci number is a number in the Fibonacci sequence, which is a sequence of numbers in which each number after the first two is the sum of the two preceding numbers. The first two numbers in the sequence are typically 0 and 1, and the sequence goes on indefinitely, with each number being the sum of the previous two. For example, the first few numbers in the Fibonacci sequence are 0, 1, 1, 2, 3, 5, 8, 13, 21, and 34.

These numbers were first introduced by Leonardo Fibonacci in his book Liber Abaci in 1202, as a solution to a problem involving the growth of a population of rabbits. The Fibonacci sequence has since found applications in mathematics and science, as well as in art and architecture.