A self-cleaning function is a very desirable feature in the oven market today, and about 60% of stoves come with it. It works by heating the oven to extremely high temperatures (over 500 degrees Fahrenheit) and cooking off all the dirt and spills for several hours. For safety reasons, the oven door usually locks during the self-clean cycle. The feature supposedly saves you from having to scrub the inside of the oven from any spills (particularly the hard-to-remove greasy ones) and requires virtually no effort to operate.
Though the self-clean setting is becoming commonplace in electric stoves, it still hikes up the average price by $250 compared to models that don't have it. Nevertheless, users love this feature, and ranges that have it are rated higher for performance and easy cleanup (unsurprisingly).