What is an outlier?

Now that is a question! A value that lies outside e.g. is much smaller or larger than most of the other values in a set! Hope that helps!

It's a data point which does not follow the trend (set by rest of the data).

An outlier is a point of data that does not fit the general trend of the data it has been collected with.

The data point that is significantly different from the other point (anomalous point). Sometimes this might occur when there is a systematic error on the experiment

An outlier is a data point which is more than 1.5 times the interquartile range above the third quartile or below the first quartile