Cash accounts
In a cash account you trade with settled funds only. Proceeds take time to settle, so the same dollars cannot be reused immediately, which naturally limits how often you can trade.
Margin accounts
A margin account lends against your equity, giving more intraday buying power and the ability to short. Leverage magnifies both directions, and margin accounts are where pattern day trader rules apply.
Choosing between them
Rules differ by broker and jurisdiction, so confirm the specifics with your broker. The practical question is whether the extra flexibility of margin is worth the added risk at your experience level.
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