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She packed everything she needed for the trip.
She packed all the things she needed for the trip.
All things or all aspects of something
He tried everything to make her happy.
He tried all possible things to make her happy.
Everything is going according to plan.
All aspects are proceeding as planned.
Often used to emphasize inclusiveness or comprehensiveness.
Use 'everything' to emphasize that no aspect is left out.
'Everything' can function as a pronoun (e.g., 'I need everything') or an adjective (e.g., 'I need everything in the box').
From Middle English 'everich thing', from Old English 'æfre' (ever) + 'þing' (thing).
Can be used as a pronoun to refer to all things or as an adjective to modify nouns.