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Technically speaking, the more a trend line holds as support or resistance then the more relevant this line becomes to traders, and also signals entry points for long or short positions depending on the role of the line. As market watchers, we analyze the past performance and behavior of the underlying commodity to understand or better yet forecast the next move and try to profit from it. As we can observe from this 3-hr (180-min) chart of the May Silver Futures contract, the shown trend line has worked as support and effectively bounced off any proximity of the price action in many instances, had you started long positions on any of these encounters, you would had profit in all cases. The question of course, as we have another enocunter, is then whether we take another long position at this junction or wait to see if the line is finally broken signaling the end of the upward move and switching our bias to the downside.
