Day trading means opening and closing all positions within the same trading day, never holding a trade overnight. It avoids overnight swap charges and gap risk, but it requires actively monitoring the market during the session and typically involves more trades — and more spread cost — than longer-term styles.
Day trading sits between scalping (much shorter holding periods) and swing trading (multi-day holding periods) on the trading-timeframe spectrum.
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Guide
Choosing a Trading Platform: MT4, MT5, cTrader and the Broker's Own
The platform decides which orders you can place, whether your stops survive a closed laptop, and how much you would have to rewrite to leave. What actually differs between the options — and the point where the platform stops mattering and the broker takes over.