EDUCATIONAL Tip :
Double Bottom : When stock corrected from high level its try to find support level at bottom before bounce back, once bounce back happens either it goes to earlier high or or earlier support at low, if it went to earlier low then this level retested if this support level does not broken and stock bounce again second time this is called as double bottom formation. double bottom technical BUY level and positive for stock uptrend short term.
Double Top : Exactly reverse to double bottom here stock make high and this high point retested second time but get rejection to go further and corrected from that level then this is called as double top formation. double top is technical SELL level and short term downtrend.