The State Opening of Parliament is a ceremonial event which formally marks the beginning of each session of the Parliament of the United Kingdom. At its core is His Majesty's "gracious speech from the throne", which is read by the monarch but written by HM Government. In the speech the monarch gives notice of forthcoming state visits, before setting out the government's legislative programme for the new parliamentary session. No business of either House of Parliament can proceed until the Sovereign’s speech has been delivered.

A legislative session is the period of time in which a legislature, in both parliamentary and presidential systems, is convened for purpose of lawmaking, usually being one of two or more smaller divisions of the entire time between two elections. A session may last for the full term of the legislature or the term may consist of a number of sessions. These may be of fixed duration, such as a year, or may be determined by the party in power. In some countries, a session of the legislature is brought to an end by an official act of prorogation, in others by a motion to adjourn sine die. In either event, the close of a session generally brings an end to all unpassed bills in the legislature, which would have to be introduced anew to continue debate in the following session.