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Fission and fusion are two different types of nuclear reactions in which large quantities of energy are released.The main difference is that fission is the process of splitting of an atom into two or more particles and fusion is the fusing or joining  of two or more atoms to form a larger one.The other major differences are listed below

# Fusion takes place in nature like stars. Fission happens with heavy elements like Uranium and fusion evolves lighter elements.

# Fission requires large critical mass and a slow neutron to initiate the process. Fusion happens when two nuclei come very close together. They join together only if the active force between them is capable of overcoming the electrostatic force that binds it.

#The energy requirement for the two processes are different.Fission only needs a low energy for splitting the atom, where as fusion takes place only under massive energy.

# Fusion reaction is  more environmental friendly to produce nuclear energy.

 

#The radioactive waste that comes with fusion is very low than what is produced by a fission reaction but fusion  produces more energy and it may be three to four times greater than fission reactions.

#Fusion produces more energy and it is less dangerous than fission reactions, fusion reactors are yet to be developed.

# Fission happens because of chain reaction, and no chain reaction happens in fusion.

#Fusion reactions is that the energy from fission can be controlled but it cannot be controlled in fusion.