Day Trading Scalping

day trading
The buying and selling of securities on the same day, often online, on the basis of small, short-term price fluctuations
Day trading refers to the practice of buying and selling financial instruments within the same trading day such that all positions are usually closed before the market close for the trading day. Traders that participate in day trading are called active traders or day traders.
(Day traders) come to market each day flat (no position) and leave the day flat. Their behavior is very short-term and often emotional.
(Day traders) hold stocks for minutes to hours making numerous trades each day usually with a cursory understanding of the companies they trade.  These investors rely on timing and minimize risk by buying and then immediately selling.

scalping
Scalping, when used in reference to trading in securities, commodities and foreign exchange, may refer to # a fraudulent form of market manipulation # a legitimate method of arbitrage of small price gaps created by the bid-ask spread.
Punish severely
Take the scalp of (an enemy)
(scalper) someone who buys something and resells it at a price far above the initial cost; "he got theater tickets through a scalper"
Sell (a ticket) for a popular event at a price higher than the official one
Scalping is the act of removing another person's scalp or a portion of their scalp, either from a dead body, or a living person.