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It allows modders to develop mods via code rather than by hand. These are often referred to as "patchers".
As a user creating a modded load order, Synthesis lets you add as many of these patcher mods as you like, and bundle them together into one single mod file: Synthesis.esp. You should rerun the Synthesis pipeline any time you add/remove mods so the patchers can change and adapt to the new content.
Easily add patchers and run patcher pipelines on your game.
Typically, you want to utilize development tools provided by Synthesis to help you create Mutagen patchers from scratch.