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Difference betwen alpha and beta decay, radioactive decay and fission reaction

i would like to know the difference between alpha decay and beta decay. i found out alpha decay is caused when there is a great ration proton to neutron. bUT I am sure about the reasons why beta decay is caused.

I would also like to know the difference between radioactive decay and fission reaction.

Any help would be really appreciated.

Thanks.
-Bharath
Beta decay is the emission of a electron or a positron

electron emission is β-
positron emission is β+

An unstable atomic nucleus with an excess of neutrons may undergo β- where a neutron is converted into a proton, or and electron.

Unstable atomic nuclei with an excess of protons may undergo β+ decay, where a proton is converted into a neutron,or a positron
isn't that physics?
fission reaction is when a neutron for example hits an enriched uranium atom, causing it to become unstable splitting into two smaller nuclei, emitting 3 extra neutrons + heat energy

(uranium fission)

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