The Opening Range (OR) is a concept used in financial markets to describe the high and low price of a security during the first 15 minutes of trading. This period is often referred to as “the open” and it provides investors with an indication of how active traders are in that particular security for the day. The OR can be used by both short-term and long-term investors as it gives them insight into potential support/resistance levels, momentum, sentiment, etc., which can help inform their decisions when entering or exiting positions.The opening range has become increasingly important over time due to advances in technology that allow traders access to real-time market data more quickly than ever before. As such, they are able to analyze trends within those first fifteen minutes much better than before; allowing them greater opportunity for profits if they make smart decisions based on what they see happening during this window of time each day. Additionally, many institutional investors also use this information when deciding whether or not they should invest larger sums into certain securities at any given moment throughout the trading session.In conclusion, understanding how stocks behave during their opening range helps provide valuable insight into future performance which allows savvy traders/investors an edge over others who may not be aware of these dynamics at play each day on Wall Street; helping ensure success no matter what type strategy one might employ while participating in today's volatile markets.