Collators guide the validators in consensus by constructing the parachain blocks. Collators preserve a full node for a selected Parachain and a full node on the Relay chain. As being a Parachain full node, they keep all required information, like transaction information, signatures, and state transitions, to assemble parachain blocks. https://howwheretobuypolkadot90998.slypage.com/28327012/manual-article-review-is-required-for-this-article