How are virus definitions built?

I’m wondering how does virus definitions look like from the inside, software side? Is it a specific code for a definition? Is it a C++ template (hahaha)? I couldn’t find an answer to that question. Is there a global and single database for virus definitions? How are they added?

The list of things concerning that area goes on and on, but I do not want to confuse you. Thanks for feedback.

Source: virus

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