Trend line is a line used to predict the future price movement for a security. Drawing a line under the successive lows or successive highs creates a trend line.
Applying "Trend line" to Securities Exams:
Technical analysts will look at the past price performance of a security to predict its future price movement. A series of higher highs and higher lows indicate an upward trend. A series of lower highs and lower lows indicates a downward trend.