Itikaf means committing oneself to something, but in Islamic contexts it refers to the staying in seclusion in a mosque, by a Muslim who knows what he is doing, for the worship of Allah.Islam recommends Muslims to practise this Sunnah and stay in the mosque in the last 10 nights of Ramadan when they should devote more of their time to worship. The Prophet’s (peace be upon him) practice in these 10 nights was to devote all his time to worship, staying up every night, eager to be attending to his worship on the Night of Decree which falls in one of these 10 nights.
