EasyJet Airline is a British airline headquartered at London Luton Airport. It carries more passengers than any other UK-based airline, operating domestic and international scheduled services on 500 routes between 118 European, North African, and West Asian airports.
When booking holiday flights, 50% of the people have no set idea about where and when specifically they want to go. In spite of this, almost all online flight booking websites need you to say exactly from which airport, to which airport, on which specific dates you want your flight.
That half of the population, including me and possibly you, know vaguely what kind of holiday they are looking for with loose criteria on type of destination/activities, rough date range or time of year, approximate budget, from one of the nearby airports, and so forth, without being specific and determined about anything!
So easyJet decided to take the initiative to provide a solution for this large population to make it easy and quick to make a holiday decision based on all available options. Something that was a perfect match with this loose and vague nature of humans' decision making process.