The treaty prohibits countries that have joined it from developing, testing, producing, manufacturing, transferring, possessing, stockpiling, hosting, using, or threatening to use nuclear weapons. They must also refrain from assisting, encouraging, or inducing others to engage in these activities.

A country that currently possesses nuclear weapons may join the treaty, so long as it agrees to remove its weapons from operational status immediately and to destroy them in a verifiable and irreversible manner, in accordance with a legally binding, time-bound plan.

Learn more about the treaty here.