It is primarily used for mission reviews from different SG teams about their offworld discoveries, as well as a conference room for offworld travels. It was also used for extreme cases of emergency caused inside the base.
Also in the briefing room are projector screens, a spiral staircase which various personnel use to access the Briefing Room and computers for personnel usage.
In June 2002, the room was transformed into some briefing center so that various scientists including Dr. Rodney McKay could work on a solution to stop the active Stargate and later, the center was kept so that everyone could keep an eye on the progress involving Colonel Jack O'Neill who was using the X-302's hyperdrive as a means of ensuring that the Earth was not destroyed when the still-active Stargate exceeded its time limit. (SG1: "Redemption, Part 1", "Redemption, Part 2")
In 2009, the briefing room was converted into a mission OPs center to observe the progress in Earth orbit concerning the Wraith Super-hive locating the coordinates for Earth. (SGA: "Enemy at the Gate")