What do the IDs mean _mby _by _id _o

Can someone explain to me what these IDs meant and how I can use them purposefully in development?

  • _mby
  • _by
  • _id
  • _o
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_id: unique entry id
_by: user id - created by
_mby: user id - modified by
_o: order - only used in collections with “custom sortable enties” activated

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