Basically, the name means what the name suggests, a dance
in which two fighters perform a dance to fuse into one
whole being. Most of you probably remember the Fusion
Dance from the Buu Saga, when Goten and Trunks used the
Fusion Dance to make everyone's favorite cocky bitch,
Gotenks. But, actually, they were not the first people
to use it. The first person was Gokou. He learned this
style of fusion during the five years of inactivity between
the end of the Cell Game and before Gohan's start at Orange
Star High School. The fusers must be similar in size,
build, and powerlevel (The stronger fighter can simply
just lower his powerlevel to match the fighter with the
lower powerlevel to meet this requirement). Any mistakes
in performing the dance can cause defective fusion's.
This form of fusion only lasts for exactly 30 minutes,
so after this time period the two fighters defuse into
their own two beings. It hasn't been successful to break
the fusion before or after the 30 minute time period.
Fusion: The fusion technique of choice for
Kaioushins, this technique is allegedly hundreds of times
better than that of the "Fusion Dance". The
two fighters that wish to fuse had to wear an earring,
each having one in the opposite ear of the other fighter.
After this is done, they can fuse into one being (Which
in prospective causes the final being to have 2 earring's
on). This fusion was meant to be permanent, but unexpected
conditions caused the breakup of the two fusers. One example
of this is in the Buu Saga, when Vegeta and Goku put on
the earring's to make the Super Strong warrior, Vegetto.
This fusion was supposed to be permanent, but when they
were spit out of Buu's stomach (after they had been absorbed),
the fusion wore off some how.
Fusion: The way of fusing by the Namekians.
This is a way for 2 Namekians to fuse into one being.
No special objects or performances are needed for this
type of fusion. The fuser just has to place his hand on
the person that he wishes to fuse with (being that the
person being fused allows the act), and they just merge
into one. There are no set time periods for this type
of fusion, and the two fighters can defuse at any point
of time. The only two times I have ever seen this done
is in the Freeza Saga (when Nail and Piccolo fuse to fight
Freeza) and in the beginning of the Cell Saga (when Piccolo
and Kami Fuse to battle Cell) When you think about it,
Piccolo's body is kinda full