Trend lines are drawn on charts to help predict the general direction of price.It also help to determine good entry and exit point.they also help to see the reversals.
Jab bhi price ak nischit jagha yaa ak nischhit tme par doo ya doo se adhik baar aake ruke usse trandeline lahate hai so esse ham pata laga sakte hai ki esse ham trande line kahate hai ..soo ye sab part hai forex bussness market ka ..