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Not a spider. Those are Opiliones aka harvestmen or daddy long legs. Like spiders they are arachnids, but they're different in many ways. They don't make webs or silk, they don't have venom glands, they can't even bite, their bodies are kind of a single fused piece, and unlike virtually all spiders they are omnivores and scavengers rather than pure predators. They're very interesting little creatures that have been on this planet since the earliest arachnids evolved in the Devonian period almost 400 million years ago.
As mentioned in that article, some of them are also social, there can be huge groups of them in one place, trying to avoid predators.