Why do Fibonacci numbers occur on so many different occasions in both mathematics and the real world?
Fibonacci numbers are defined by the recursive definition $F_{n+2} = F_{n+1} + F_n$, where $F_0 = 0$ and $F_1 = 1$. One can also start with the values $F_1 = 1$ and $F_2 = 1$, which yields a sequence that is the same (except for the first element). The Fibonacci sequence is one of the most simple linear recursions.

In mathematics, simple concepts are often building blocks in more complex structures, theorems and their proofs. Also, Mathematicians often start exploring the landscape of mathematics by starting with something simple and then exploring the boundaries of the thing they investigate. Consequently, the simply thing often never completely vanishes and even occurs again at some point in some shape or form. Taking this into consideration, it is not surprising that the Fibonacci sequence occurs so often in mathematics.

In nature, the Fibonacci numbers occur, among other things, in concepts like the reproduction of Rabbits or the arrangement of homogeneous structures like the spirals of the Roman cauliflower. These concepts naturally follow (approximately) the Fibonacci numbers due to things like the how Rabbit reproduction is discretized into generations and how the Fibonacci numbers naturally describe certain shapes in the real world. In addition to that, nature sometimes finds local evolutionary optima in simplicity. More precisely, evolution might lead to concepts that are simple to formulate, which may correlate to how random mutations may with higher probability lead to concepts that can be encoded into the genome in more simple terms compared to more difficult ones.

In my reply, I focused strongly on the concept of simplicity. But this may indeed be an important factor in both mathematics and nature. Occam's razor empirically plays an important part in science for a good reason.
This answer is a little complicated for me... can you break it down into more simpler terms?
Sure! I have simplified the answer for you:
The Fibonacci sequence is a series of numbers where each number is the sum of the two preceding numbers. This sequence is found in nature and in math, and is often associated with simplicity. Simple concepts are important in both math and nature, and can lead to evolutionary advantages. The sequence occurs naturally in things like rabbit reproduction and the arrangement of certain structures. Simplicity is an important principle in science, and helps guide scientific investigation.
What are the importance of fibonacci series?