Boile eggs are eggs (typically chicken's eggs) cooked by immersion in boiling water with their shells unbroken. Eggs cooked in water without their shells are known as poached eggs. Hard-boiled eggs are boiled long enough for both the egg yolk and the egg white to solidify, while a soft-boiled egg's yolk, and sometimes even the white, remains at least partially liquid. The egg timer was so-named due to its common usage in timing the boiling of eggs.