What is the difference between the polycondensation reaction and the polymerization reaction? what are their similarities?

The similarity of the reactions of polymerization and polycondensation lies in the fact that in both cases a high molecular weight product is formed – a polymer.
The difference between these processes is that in the case of polymerization, the polymer is the only reaction product, while in the polycondensation reactions, in addition to the polymer, low-molecular by-products are formed.

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