Tikkun Explained

Tikkun/Tikun/Tiqqun is a Hebrew word meaning "amending/fixing". It has several connotations in Judaism:

Traditional

Tikkun (book), a book of Torah scroll text
Tohu and Tikkun, the two stages of Existence described in the Kabbalah of Isaac Luria
Tikkun refers to the nightly/early morning synagogue readings on certain Jewish holidays, for example, Hoshana Rabbah
Tikkun HaKlali, ten psalms that correspond to ten types of melody
Tikkun olam, the popular Jewish concept of "mending the world"