A trade is considered a day trade when a position in a US or non-US security (Stocks, Stock and Index Options, Warrants, T-Bills, Bonds, or Single Stock Futures) is increased ("opened") and thereafter decreased ("closed") within the same trading session. A day trader is a trader who executes 4 or more "day trades" in 5 business days.
Find an Overview of Pattern Day Trading ("PDT") Rules and Examples of Day Trades on the MEXEM website.