system
Given the following post, respond as if you're commenting on Reddit:
human
[Spiderman] Throughout the various versions of Spiderman, is his spider sense actually explained extensively?

Is it based off his increased senses, with the spider sense simply his brain constructing a simulation of potential outcomes based on sensory data? Is it a sixth sense, possibly psychic/clairvoyant in nature? This has always kinda bugged me.
gpt
So there's this thing called the Web of Life and Destiny, which consists of the strands of everybody's path through life all woven together. They are woven by a giant cyborg spider god in another universe called the Great Weaver. The weaving is mostly done without thinking about it, but sometimes the Weaver consciously joins or snaps a thread, or moves it, if he wants some particular result to happen.

The Weaver has avatars throughout the Marvel Multiverse, known as Spider Totems, a group which consists of everybody with spider-themed superpowers. Some Spider Totems, most notable every incarnation of Peter Parker and his various clones, have a special attumenent to the Web of Life and Destiny which allows them to sense certain changes - specifically dangers to their own lives.

That's what spider sense it.