It's the main mode and the core of the game. A 52vs52 PvP team battle in one match. And with the large number of players, the maps are also big, simulating a warfare zone in which you can go to many places within the map in order to attack your enemies.
The goal is to reduce the enemy team's strength gauge to zero. Similar to other games, this can be done by destroying enemies or by holding the majority of the map's control points. Additionally, each team will have 2-3 bases depending on the map, and damaging the bases core can remove large chunks from the strength gauge.
Also, some maps have what is known as a Battle Area (BA), which is a large yellow circle on the map. Similar to King of the Hill, having majority control over this area will subtract from the enemies gauge.
Scattered around the map are supply containers. By picking these up and delivering them to a control point, you increase your team's tactical gauge. Team commanders can use this gauge to perform various actions.