Gaps shows the strength of the trend. Gaps are named based on the area in which they appear, They are a strong indicator of trend .
There are for types of gaps
Area gap – appears in the trading zone and is expected to fill with less volume
Breakout gap – appears at the time of breakout from the trading zone and is not expected to fuill
Runaway gap – appears after the breakout, shows the panic of short sellers covering
Exhaustion gap – covers the gap the same day itself, shows a trend reversal due to buyers booing their profits