I'tikaf is a unique Ibada (service to God) associated with Ramadan, in which a person gives up all his normal activities and enters a mosque for a specific period. There is great merit in it, and in most of the city neighbourhoods there are at least one or two mosques dedicated to this. Most devoted families will have at least one person who performs an I'tikaf for the last 10 days of Ramadan, but even those who cannot spare the full 10 days are encouraged to spend as much time in the mosque as possible during the holy month.
Through direct Ibada we "charge our batteries"; the indirect ones allow us to use the power so accumulated in driving the vehicle of our life. Ramadan is the month for rebuilding our spiritual strength. How much we benefit from it is up to us.