When drawing graphs on a Cartesian Plane, a feature is any of the following:
x-intercept (Root)
y-intercept
Gradient
Line symmetry
Maximum or Minimum turning point
When looking at Statistics & Probability, a feature is any of the following:
Peak
Spread (Range & Interquartile Range)
Centre
Middle 50%
Average (Mean, Median, Mode)
Highest, Lowest value
Outlier
Pattern
Trend
Relationship