The term "day trading" causes some confusion.
With stocks, "daytrading" means settling up with your broker within the same day that stocks are bought/sold-short, and that's the origin of the word. It's done entirely on margin without ever paying for or buying the stock, because of daily settlement.
With forex, "daytrading" is used by different people with different meanings. Some even mean "trading from daily charts" (though that's a strange use of the word, if you ask me). Some mean "never holding a position overnight".
Forex trading through a retail broker is a whole different world from other types of trading, because no real trade is typically done in a real market - you're just having a bet against your "broker" (who holds the other side of your trade). It isn't a "real market" at all.
That's something else very fundamental the lessons here should start by clarifying, really.
Intraday forex traders are typically using 5-minute/10-minute/15-minute charts, but often looking at higher time-frame as well, to get their overall directional bias.
But certainly trading from 5-minute charts is typically "intraday trading", in the forex world, yes. People trading that way are usually not holding positions open overnight.
Hope that helps.