What is the purpose of combos?

Hi, I noticed many people talking about combos and fusions.


1. What is the point of combos?
2. What happens to the bey when you turn it into a combo? 
3. Does it keep it’s type? 
4. And what stats get better?
5. When is it good to use a combo?
1-Changing how the bey reacts to make it better. For example the savior layer on savior valkryie is really good but if you use it like how it is out of the box then it will be pretty bad.
2- the point of it is to make it better or more fun usually
3 it could and its type could switch
4 depends, you can do a combo for almost anything whether its stamina, attack, defense,balance, in fact, beyblade becomes way more complex and advanced when combos get in (which is 99% of the time in more competitive play)
5 if you want to make it better than basically always, as its almost impossible for a beyblade to be perfect out of the box, you could make it way better with combos
How to know which combos are good is by testing