Plain English
An all-time high is the highest closing price an asset has ever reached. The opposite is the all-time low (ATL). ATH is psychologically heavy — many holders sell into prior highs, some new buyers wait until ATH is broken before entering on “blue sky” momentum.
How it actually works
Aggregators publish ATHs per asset and per pair (BTC/USD ATH is different from BTC/ETH ATH). Real-time ATH breaks generate technical and emotional momentum: stop-losses get triggered against shorts, sidelined capital activates, and price often accelerates on the first break before consolidating.
What it means for you
ATH is a checkpoint, not a destination. Some assets break to new ATHs and rip 5–10x further; others double-top and roll over for years. Use it as an event horizon for rebalancing — if your crypto allocation hits an ATH and exceeds your target weight, this is when discipline matters most.
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Educational content only. Not investment, tax, or legal advice.