It is a number that is then fed to the map genertor to create a pseudo-random map.
Random number generators are actually just mathematical functions that take an input number, and convert it to an output number with a certain type of distribution. Random number function need an input, which is typically called the 'seed'.
Basically, in the editor sense, its a way of generating a random map, but saving a single input variable so that you can recreate that map again and again.
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