Bitcoin Chainparams.cpp what is - base58Prefixes[PUBKEY_ADDRESS]?

Bitcoin Chainparams.cpp what is - base58Prefixes[PUBKEY_ADDRESS]?

I am creating an altcoin for fun from the Bitcoin core source code, and I am currently looking through the code in chainparams.cpp and I have come across this line:

base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1,0);

What does this code do? Why would you want the first character in this vector to be 0?

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