What exactly does it mean to convert to Judaism?

Conversion is the process by which a non-Jew joins the Jewish people through study, commitment, and — in traditional practice — a beit din, immersion in a mikveh, and (for males) circumcision or a symbolic act. It is understood as joining a people and a covenant, not only adopting a creed.

Many assume conversion is 'believing in Judaism' the way one might join a church. In Jewish tradition it is also — and often primarily — joining a people and taking on communal obligations, which is why the process is communal rather than purely personal.

Ger /geyr/

A convert; one who joins the Jewish people.

Beit din /beyt DEEN/

A rabbinic court that supervises conversion.

• Orthodox: conversion is binding and requires a qualified beit din, kabbalat mitzvot, mikveh, and circumcision; the convert joins the halachic people.
• Conservative/Masorti: conversion follows a halachic process within the movement and is recognized by many — not all — authorities.
• Reform: conversion centers informed commitment and community; it is recognized within Reform and by many, but not all, communities.

Rabbinic conversion law consolidated around study, the beit din, and immersion; the formal requirements are traced through the Mishnah and the Talmud and codified in the Shulchan Arukh.

Across traditional sources, conversion involves joining the Jewish people and taking on the mitzvot, formalized through a communal process rather than private belief alone.

What counts as a valid process, who must sit on the beit din, what 'acceptance of the commandments' means in practice, and which conversions are recognized by which communities.

The meaning you adopt shapes which community you approach, what the process involves, and which other communities will recognize the result. Verify the specific requirements with the community you intend to join.