Normal mode is the general mode players can journey through when they are not doing missions in an event area. Most commonly, players travel through normal mode during PVP events, as those events have no special area associated with them.
There are currently four areas of normal mode available. They are:
Normal mode missions feature observations by Zar, your disembodied hand companion, and each area typically has a theme and backstory that you can explore. Also, every 3 missions, players encounter bosses and receive prizes for defeating them.