The General Counter-Spell (Finite or Finite Incantatem) is a counter-spell for general use. It may be used in duels or on an entire home, as a precaution before a wizard answers the door. It is taught at Hogwarts School of Witchcraft and Wizardry.
It's currently unknown by who or when the counter-spell was invented. This spell is one of the seven covered in The Standard Book of Spells, Grade 2 by Miranda Goshawk.
The General Counter-Spell terminates all spell effects ranging from simple spells like the Jelly-Legs Jinx to more complicated spells such as Atmospheric Charms. It's unknown if there is a difference between Finite and Finite Incantatem, in terms of power or usage, it's possible that Finite is simply a more straight forward way of casting the General Counter-Spell.