Answer: Scalping is one of the quickest strategies employed by active traders. It includes exploiting various price gaps caused by bid/ask spreads and order flows. The strategy generally works by making the spread or buying at the bid price and selling at the ask price to receive the difference between the two price points. Scalpers attempt to hold their positions for a short period, thus decreasing the risk associated with the strategy. Additionally, a scalper does not try to exploit large moves or move high volumes; rather, they try to take advantage of small moves that occur frequently and move smaller volumes more often. Since the level of profits per trade is small, scalpers look for more liquid markets to increase the frequency of their trades. And unlike swing traders, scalpers like quiet markets that aren't prone to sudden price movements so they can potentially make the spread repeatedly on the same bid/ask prices.
A combined suite of three sophisticated order flow indicators which can be used both together and individually, offering a superior bank-level view of the markets.
What It Does
• Allows you to analyse order flow in a number of ways via effective visual aids plotted automatically on your charts.
• Volume profile: Highlights key order zones in the market including low value areas, high value areas and areas where the most orders were placed in that session creating a map of orders in the market.
• Delta Book & Pressure: Gives powerful analysis of strength and flow of orders in the market with speed showing the speed of transactions being processed at any one time and book pressure looking at the net difference between buying and selling strength as well as the difference between volume traded at bid price and volume traded at ask prices.
• VWAP: Plots the Volume Weighted Average Price of the instrument by taking the Dollar value of all trading periods and then dividing by the total trading volume for the current session. The indicator also plots standard deviations around the average.
And for Delta Order Flow term we can follow this link for better understanding:
http://www.freepatentsonline.com/article/Economic-Bulletin/187324804.html