Under Article 102 of the UN Charter the Secretariat registers and publishes treaties, and the Treaty Section does that work
Background
The Treaty Section of the United Nations Office of Legal Affairs is responsible for two key areas of work.
The first is the discharge of the depositary functions of the Secretary-General of the United Nations under more than 560 multilateral treaties.
The second is the registration and publication of treaties and international agreements under Article 102 of the Charter of the United Nations.
The United Nations Treaty Collection is a global portal providing on-line access to information relating to this work.
On the United Nations Treaty Series Online page, users can access information on the more than 250,000 treaties or treaty actions that have been registered and published by the Secretariat.
That database includes the texts of treaties in their authentic languages, along with translations into English or French.
For each treaty deposited with the Secretary-General, the Status of Treaties pages give the title, date and place of conclusion, participants, date and method of entry into force, and reservations and objections.
Treaties registered in accordance with article 18 of the Covenant of the League of Nations are available through the League of Nations Treaty Series.
In plain words
UNTC United Nations Treaty Collection — The global portal that gives on-line access to the depositary, registration and publication work of the Treaty Section.
Depositary depositary of a treaty — The authority that keeps the original text of a treaty and records signatures, ratifications and accessions.
OLA Office of Legal Affairs — The United Nations office whose Treaty Section carries out the depositary, registration and publication functions.