Trend: Trend is the general direction, either upward or downward, in which prices have been moving.
Trendline: In charting, a Trendline is a line drawn across the bottom or top of a price chart indicating the direction or trend of price movement. If up, the trendline is called bullish; if down, it is called bearish.
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Naked options trading is very risky - many people lose money trading them. It is recommended contacting your broker or investment professional to find out about trading risk and margin requirements before getting involved into trading uncovered options.