Essentially a set of moving stairs which transport an individual from high ground to low ground or from low ground to high ground.
There is a commonly ignored rule of escalator etiquette which states that people are to walk on the left and stand on the right sides of the escalator. Many people ignore this rule and stand on both sides of the escalator resuling in escalator traffic jams. These jams are especially annoying when people are in a rush.
Many people believe escalators are indicatave of the laziness of the human race. Instead or walking up stairs, people insist on being effortlessly floated to the top of their staircase.