A cent account is a live forex account denominated in cents rather than whole units of the account currency, so a 100 dollar deposit is displayed as 10,000 cents. Lot sizes, profit and loss are shown in the same cent units, which means positions — and therefore the money at risk per trade — can be far smaller than on a standard account. Traders commonly use a cent account to test a strategy, a platform or an expert advisor with real money but very small exposure, as a step between a demo account and full-size trading.
Conditions are still real: spreads, swaps, commissions and slippage all apply, and losses are real money even though the balance figures look large.
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Guide
Account Types, and What Actually Changes Between Them
Standard, raw, cent, swap-free, professional. What genuinely differs between the tiers, and the one reclassification that costs you protections.