Prorogation [pronounced 'pro-ro-ga-tion'] marks the end of a parliamentary session. It is the formal name given to the period between the end of a session of Parliament and the State Opening of Parliament that begins the next session. The parliamentary session may also be prorogued before Parliament is dissolved.
At the beginning of September 2019, Boris Johnson the Prime Minister Prorogue'd parliament, a decision that caused a furore among MPs as they thought parliament was being stifled. The act is normal when a Queens speech is enabled usually before a term of parliament, but the length was what caused the commotion as it left very little time for a debate about Brexit.
People were so incensed that the matter was taken to court lead by Gina Miller using the label "fight for democracy", it was very quickly shuffled up to the high court.
Three of the most senior judges in England and Wales dismissed her claim that the prime minister acted unlawfully in giving advice to the Queen to suspend parliament from next week at a time of momentous political upheaval. The lord chief justice, Lord Burnett of Maldon, the master of the rolls, Sir Terence Etherton, and the president of the Queen’s bench division, Dame Victoria Sharp, granted permission for the case to be appealed to the Supreme court.
That day has arrived as we all now patiently await the Supreme courts decision.
Lady Hale in the Supreme Court has stated that the Prorogation was unlawful and therefore is no longer running AND this was a unanimous decision by all eleven.
Link to Lady Hale's summary:-