The Investigate tab enables you to add new graphs, choose the machine you want to run such as Company Stalker, Twitter Digger or Footprint, and add new entities.
Apart from that, it allows you to identify key relationships between various data and identify common infrastructure between them. It helps you to easily map information regarding networks, organizations, ideas, people etc.
Maltego is a straightforward and reliable software solution geared towards users who need to gather various information and get a better overview to the environment that an organization operates.