Why Is The Mikvah So Important?

Answer 1

The Mikvah is the ritual cleansing of a woman after her period, the reason being that blood is considered unpure and she has just had a period of blood! This article clears up a number of misconceptions about the Mikvah

http://tiny.cc/mikvah

Answer 2

A mikvah, or ritual bath, is found in most Orthodox Jewish communities, even small one, and in most large Jewish communities, even non-Orthodox ones. Dunking in a mikvah is a purification ritual. Observant Jewish women dunk after their periods. Some Jewish men dunk before the Sabbath or festivals. Converts dunk to mark the completion of their conversion. Silverware and metal cookpots are dunked as part of the ritual to make them kosher. In a pinch, just about any natural body of water open to the sky or spring-fed can be used as a mikvah, so long as it is large enough to dunk in.