That is accurate, but too thin.
A mikvah is one of the clearest examples of how Judaism treats physical action as part of religious transition. It links law, body, time, and community in a single act of immersion.
A mikvah is a pool for ritual immersion
Britannica defines the mikvah as a pool of natural water used for the restoration of ritual purity. My Jewish Learning puts the modern point more practically: a mikveh is a Jewish ritual bath used for conversion and a range of other traditional and contemporary purposes.
Together those definitions show both continuity and adaptation.
The mikvah remains a legal institution, but many Jews encounter it as a threshold practice.
It is still required in some core areas of Jewish life
My Jewish Learning notes that immersion in a mikveh is required as part of conversion to Judaism and is also required in traditional practice before marriage and in the observance of niddah, the laws related to menstruation and family purity.
Britannica adds that converts require ritual immersion according to halakhic tradition and that observant communities maintained mikvah use even after many ancient purity laws became less central after the destruction of the Temple.
So the mikvah did not disappear when sacrificial worship ended. It remained important in selected but durable parts of Jewish life.
The water has to meet legal requirements
Britannica explains that the mikvah is not just any bath. Classical Jewish law specifies the kind and quantity of water needed. My Jewish Learning describes the modern version, where treated water is connected to naturally gathered rainwater so that the immersion pool can still meet halakhic requirements.
That legal specificity is part of the point.
The mikvah is not about feeling symbolic only. It is also about meeting a defined religious standard.
The mikvah carries different meanings for different Jews
In traditional settings the mikvah is closely tied to law, conversion, and family practice. In newer settings, My Jewish Learning notes, some Jews use mikvah for recovery, grief, healing, milestone marking, or personal transition.
Not every Jewish movement treats all those uses the same way. But the expansion is still revealing. The mikvah keeps attracting people because immersion offers a bodily way to mark change.
Why the institution still matters
The mikvah still matters because Judaism does not treat religious life as purely mental. Covenant, status, transition, and preparation often take material form.
Water becomes a medium for crossing from one state to another, whether the context is conversion, family purity, pre-holiday preparation, or a self-conscious new beginning.
The shortest accurate answer
A mikvah is a Jewish ritual bath used for immersion in legally and spiritually significant moments, especially conversion and certain purity-related practices.
It remains powerful because it turns transition into something the body actually does.