Plain English
A nonce is a per-account counter that goes up by one with every transaction you send. Your first transaction is nonce 0, then 1, then 2. The network processes them in nonce order — if nonce 5 arrives before nonce 4 is mined, nonce 5 sits and waits.
How it actually works
Nonces solve two problems: ordering (so two competing transactions cannot replay each other) and replay protection (an attacker cannot resubmit your old transaction because the nonce is already used). Each wallet tracks the next nonce locally; if it gets out of sync (often after offline signing or stuck transactions), all subsequent transactions stall.
What it means for you
When a transaction is “stuck pending” on Ethereum, the usual cause is a missing or low-fee nonce ahead of it. The fix: speed up or cancel the stuck transaction (resubmit with the same nonce + higher gas), and the downstream queue unblocks. Wallets like Rabby and Frame expose nonce management directly.
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Educational content only. Not investment, tax, or legal advice.