From the oxford dictionary, retracement means to trace again or back. That is the meaning following the dictionary definition, but in forex, it’s a bit expanded, other than the fact that it may sound analogous to a Keyline, retracement, considered independently could mean something slightly different, from the Investopedia, it means a temporary reversal in the direction of a stock's price that goes against the prevailing trend. Though a very important concept, rarely does a retracement signifies a change in the larger trend, in fact, most retracements connotes the continuation of the prevailing trend. Retracements is also known as the pullback, it’s the end of a retracement that becomes the key line. Again, that a retracement has ended at a certain price does not necessarily mean that’s the Keyline, every level that looks like a potential key line have to be evaluated properly and back tested before any conclusion is arrived at that, that is the Keyline. Understanding how to draw a Keyline very well will triple you profits, in fact just understanding how to draw Keyline’s, you’re 50% making it in forex. While the word Keyline sounds too difficult to clutch, it’s so simplistic yet not easy for some to grasp. Well, no one was born with it, takes persistence and incessant practice to grasp but once understood, it becomes part of you. Just like a learner driver graduating to professional driver, it will take you very little effort to locate a key line. Here is a tip on how to get the key line. In a downtrend, Keyline are the resistance lines that stop retracements from continuing in the direction opposite the overall bearish trend, In this case, you should look for green, or bullish inside bar, while price was breaking below the Keyline. In an uptrend, Keyline are the support lines that stop retracing from continuing in the direction opposite the overall bullish trend. In this case, you should look for red, or bearish inside bar, while price was breaking above the Keyline.