Namekian Fusion

All Namekians can fuses just by placing a limb upon another Namek. Namekian Fusions can defuses but in a special case Piccolo cannot Defuses with Kame witch is the reason of them being the same person......

Fusion Dance

Fusion dance is done by doing a dance that mirrors the person you want to fuse with, they must be around the same size and build, it lasts for one hour and then you must rest for 30 minutes before you can try to fuses again.

Potara Fusion

The potara fusion is done by wearing one erring on the opposite side of the face of the person you want to fuses with,  This Fusion type is so called a permanent fusion but Vegeta and Goku break apart when they are absorbed by Buu.